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Message-ID: <20140403123656.0eb158a4@gandalf.local.home>
Date: Thu, 3 Apr 2014 12:36:56 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
LKML <linux-kernel@...r.kernel.org>,
Ingo Molnar <mingo@...nel.org>,
Frederic Weisbecker <fweisbec@...il.com>,
Namhyung Kim <namhyung@...nel.org>,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: Re: [GIT PULL] tracing: Cleanups and new features for tracing
Hi Linus,
Just making sure this didn't get lost in your spam folder again.
-- Steve
On Tue, 1 Apr 2014 11:28:47 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:
>
> Linus,
>
> Most of the changes were largely clean ups, and some documentation.
> But there were a few features that were added.
>
> Uprobes now work with event triggers and multi buffers.
> Uprobes have support under ftrace and perf.
>
> The big feature is that the function tracer can now be used within the
> multi buffer instances. That is, you can now trace some functions
> in one buffer, others in another buffer, all functions in a third buffer
> and so on. They are basically agnostic from each other. This only
> works for the function tracer and not for the function graph trace,
> although you can have the function graph tracer running in the top level
> buffer (or any tracer for that matter) and have different function tracing
> going on in the sub buffers.
>
> Note, I'm still working on a change with Mathieu Desnoyers because of
> the tracepoint updates that caused ftrace to break. 3.14 had a quick fix
> for the problem, but we are now working on a cleaner solution. His
> solution requires changes from both my urgent branch (which was
> included in 3.14) as well as my 3.15 updates. I'm pushing what I have
> now so that we can work on a clean solution. The real fix is actually a
> nice cleanup of the code that shrinks the overhead a bit. We are
> working on some small details, but something should be ready, and
> tested before the merge window closes. If you pull this branch, I'll
> base the work off of that pull commit (and still run it through all
> my tests), so that his code has both the 3.14 and 3.15 updates.
>
> Please pull the latest trace-3.15 tree, which can be found at:
>
>
> git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git
> trace-3.15
>
> Tag SHA1: 0e0cdda7cee4e1ba7bbaf77dc718aaba028bab16
> Head SHA1: 3862807880acc0adaef6749738d210c9f45c3049
>
>
> Aaron Tomlin (1):
> tracing: Add BUG_ON when stack end location is over written
>
> Filipe Brandenburger (2):
> tracing: Correctly expand len expressions from __dynamic_array macro
> tracing: Evaluate len expression only once in __dynamic_array macro
>
> Jiri Slaby (6):
> ftrace: Cleanup of global variables ftrace_new_pgs and ftrace_update_cnt
> ftrace: Inline the code from ftrace_dyn_table_alloc()
> ftrace: Pass retval through return in ftrace_dyn_arch_init()
> ftrace: Do not pass data to ftrace_dyn_arch_init
> ftrace: Remove freelist from struct dyn_ftrace
> ftrace: Fix compilation warning about control_ops_free
>
> Mathieu Desnoyers (3):
> tracepoints: API doc update to data argument
> tracepoints: API doc update to tracepoint_probe_register() return value
> tracepoint: Remove unused API functions
>
> Namhyung Kim (4):
> tracing/uprobes: Rename uprobe_{trace,perf}_print() functions
> tracing/uprobes: Move argument fetching to uprobe_dispatcher()
> tracing/uprobes: Support event triggering
> tracing/uprobes: Support mix of ftrace and perf
>
> Petr Mladek (3):
> ftrace/x86: One more missing sync after fixup of function modification failure
> ftrace: Warn on error when modifying ftrace function
> ftrace/x86: BUG when ftrace recovery fails
>
> Sasha Levin (1):
> ftrace: Constify ftrace_text_reserved
>
> Steven Rostedt (5):
> tracing: Add trace_clock=<clock> kernel parameter
> tracing: Move raw output code from macro to standalone function
> tracing: Move event storage for array from macro to standalone function
> tracing: Use helper functions in event assignment to shrink macro size
> tracing: Warn if a tracepoint is not set via debugfs
>
> Steven Rostedt (Red Hat) (19):
> tracing: Pass trace_array to set_flag callback
> tracing: Pass trace_array to flag_changed callback
> tracing: Set up infrastructure to allow tracers for instances
> tracing: Only let top level have option files
> ftrace: Add private data to ftrace_ops
> ftrace: Copy ops private to global_ops private
> tracing: Disable tracers before deletion of instance
> tracing: Convert tracer->enabled to counter
> ftrace: Allow instances to use function tracing
> ftrace: Pass in global_ops for use with filtering files
> ftrace: Allow for function tracing instance to filter functions
> ftrace: Have static function trace clear ENABLED flag on unregister
> ftrace/x86: Run a sync after fixup on failure
> tracepoint: Do not waste memory on mods with no tracepoints
> ftrace/x86: Have ftrace_write() return -EPERM and clean up callers
> tracing: Fix event header writeback.h to include tracepoint.h
> tracing: Fix event header migrate.h to include tracepoint.h
> tracing/module: Replace include of tracepoint.h with jump_label.h in module.h
> Revert "tracing: Move event storage for array from macro to standalone function"
>
> zhangwei(Jovi) (1):
> tracing/uprobes: Support ftrace_event_file base multibuffer
>
> ----
> Documentation/trace/ftrace-design.txt | 5 +-
> arch/arm/kernel/ftrace.c | 4 +-
> arch/blackfin/kernel/ftrace.c | 5 +-
> arch/ia64/kernel/ftrace.c | 4 +-
> arch/metag/kernel/ftrace.c | 5 +-
> arch/microblaze/kernel/ftrace.c | 5 +-
> arch/mips/kernel/ftrace.c | 5 +-
> arch/powerpc/kernel/ftrace.c | 7 +-
> arch/s390/kernel/ftrace.c | 3 +-
> arch/sh/kernel/ftrace.c | 5 +-
> arch/sparc/kernel/ftrace.c | 6 +-
> arch/tile/kernel/ftrace.c | 4 +-
> arch/x86/kernel/ftrace.c | 55 ++++----
> include/linux/ftrace.h | 27 ++--
> include/linux/ftrace_event.h | 28 ++++
> include/linux/module.h | 2 +-
> include/linux/tracepoint.h | 18 ---
> include/trace/events/migrate.h | 2 +
> include/trace/events/writeback.h | 1 +
> include/trace/ftrace.h | 38 ++---
> kernel/trace/blktrace.c | 3 +-
> kernel/trace/ftrace.c | 162 ++++++++++++----------
> kernel/trace/trace.c | 187 +++++++++++++++++++------
> kernel/trace/trace.h | 38 ++++-
> kernel/trace/trace_events.c | 30 ++++
> kernel/trace/trace_functions.c | 143 +++++++++++++------
> kernel/trace/trace_functions_graph.c | 3 +-
> kernel/trace/trace_irqsoff.c | 10 +-
> kernel/trace/trace_kprobe.c | 17 ---
> kernel/trace/trace_nop.c | 5 +-
> kernel/trace/trace_output.c | 31 +++++
> kernel/trace/trace_probe.h | 17 +++
> kernel/trace/trace_sched_wakeup.c | 10 +-
> kernel/trace/trace_stack.c | 3 +
> kernel/trace/trace_uprobe.c | 191 ++++++++++++++++++--------
> kernel/tracepoint.c | 251 +++++-----------------------------
> 36 files changed, 739 insertions(+), 591 deletions(-)
> ---------------------------
> diff --git a/Documentation/trace/ftrace-design.txt b/Documentation/trace/ftrace-design.txt
> index 79fcafc..3f669b9 100644
> --- a/Documentation/trace/ftrace-design.txt
> +++ b/Documentation/trace/ftrace-design.txt
> @@ -358,11 +358,8 @@ Every arch has an init callback function. If you need to do something early on
> to initialize some state, this is the time to do that. Otherwise, this simple
> function below should be sufficient for most people:
>
> -int __init ftrace_dyn_arch_init(void *data)
> +int __init ftrace_dyn_arch_init(void)
> {
> - /* return value is done indirectly via data */
> - *(unsigned long *)data = 0;
> -
> return 0;
> }
>
> diff --git a/arch/arm/kernel/ftrace.c b/arch/arm/kernel/ftrace.c
> index 34e5664..c108ddc 100644
> --- a/arch/arm/kernel/ftrace.c
> +++ b/arch/arm/kernel/ftrace.c
> @@ -156,10 +156,8 @@ int ftrace_make_nop(struct module *mod,
> return ret;
> }
>
> -int __init ftrace_dyn_arch_init(void *data)
> +int __init ftrace_dyn_arch_init(void)
> {
> - *(unsigned long *)data = 0;
> -
> return 0;
> }
> #endif /* CONFIG_DYNAMIC_FTRACE */
> diff --git a/arch/blackfin/kernel/ftrace.c b/arch/blackfin/kernel/ftrace.c
> index 9277905..095de0f 100644
> --- a/arch/blackfin/kernel/ftrace.c
> +++ b/arch/blackfin/kernel/ftrace.c
> @@ -65,11 +65,8 @@ int ftrace_update_ftrace_func(ftrace_func_t func)
> return ftrace_modify_code(ip, call, sizeof(call));
> }
>
> -int __init ftrace_dyn_arch_init(void *data)
> +int __init ftrace_dyn_arch_init(void)
> {
> - /* return value is done indirectly via data */
> - *(unsigned long *)data = 0;
> -
> return 0;
> }
>
> diff --git a/arch/ia64/kernel/ftrace.c b/arch/ia64/kernel/ftrace.c
> index 7fc8c96..3b0c2aa 100644
> --- a/arch/ia64/kernel/ftrace.c
> +++ b/arch/ia64/kernel/ftrace.c
> @@ -198,9 +198,7 @@ int ftrace_update_ftrace_func(ftrace_func_t func)
> }
>
> /* run from kstop_machine */
> -int __init ftrace_dyn_arch_init(void *data)
> +int __init ftrace_dyn_arch_init(void)
> {
> - *(unsigned long *)data = 0;
> -
> return 0;
> }
> diff --git a/arch/metag/kernel/ftrace.c b/arch/metag/kernel/ftrace.c
> index a774f32..ed1d685 100644
> --- a/arch/metag/kernel/ftrace.c
> +++ b/arch/metag/kernel/ftrace.c
> @@ -117,10 +117,7 @@ int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
> }
>
> /* run from kstop_machine */
> -int __init ftrace_dyn_arch_init(void *data)
> +int __init ftrace_dyn_arch_init(void)
> {
> - /* The return code is returned via data */
> - writel(0, data);
> -
> return 0;
> }
> diff --git a/arch/microblaze/kernel/ftrace.c b/arch/microblaze/kernel/ftrace.c
> index e8a5e9c..bbcd253 100644
> --- a/arch/microblaze/kernel/ftrace.c
> +++ b/arch/microblaze/kernel/ftrace.c
> @@ -171,11 +171,8 @@ int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
> return ret;
> }
>
> -int __init ftrace_dyn_arch_init(void *data)
> +int __init ftrace_dyn_arch_init(void)
> {
> - /* The return code is retured via data */
> - *(unsigned long *)data = 0;
> -
> return 0;
> }
>
> diff --git a/arch/mips/kernel/ftrace.c b/arch/mips/kernel/ftrace.c
> index 185ba25..1ba7afe 100644
> --- a/arch/mips/kernel/ftrace.c
> +++ b/arch/mips/kernel/ftrace.c
> @@ -198,7 +198,7 @@ int ftrace_update_ftrace_func(ftrace_func_t func)
> return ftrace_modify_code(FTRACE_CALL_IP, new);
> }
>
> -int __init ftrace_dyn_arch_init(void *data)
> +int __init ftrace_dyn_arch_init(void)
> {
> /* Encode the instructions when booting */
> ftrace_dyn_arch_init_insns();
> @@ -206,9 +206,6 @@ int __init ftrace_dyn_arch_init(void *data)
> /* Remove "b ftrace_stub" to ensure ftrace_caller() is executed */
> ftrace_modify_code(MCOUNT_ADDR, INSN_NOP);
>
> - /* The return code is retured via data */
> - *(unsigned long *)data = 0;
> -
> return 0;
> }
> #endif /* CONFIG_DYNAMIC_FTRACE */
> diff --git a/arch/powerpc/kernel/ftrace.c b/arch/powerpc/kernel/ftrace.c
> index 9b27b29..71ce4cb 100644
> --- a/arch/powerpc/kernel/ftrace.c
> +++ b/arch/powerpc/kernel/ftrace.c
> @@ -531,13 +531,8 @@ void arch_ftrace_update_code(int command)
> ftrace_disable_ftrace_graph_caller();
> }
>
> -int __init ftrace_dyn_arch_init(void *data)
> +int __init ftrace_dyn_arch_init(void)
> {
> - /* caller expects data to be zero */
> - unsigned long *p = data;
> -
> - *p = 0;
> -
> return 0;
> }
> #endif /* CONFIG_DYNAMIC_FTRACE */
> diff --git a/arch/s390/kernel/ftrace.c b/arch/s390/kernel/ftrace.c
> index 224db03..54d6493 100644
> --- a/arch/s390/kernel/ftrace.c
> +++ b/arch/s390/kernel/ftrace.c
> @@ -130,9 +130,8 @@ int ftrace_update_ftrace_func(ftrace_func_t func)
> return 0;
> }
>
> -int __init ftrace_dyn_arch_init(void *data)
> +int __init ftrace_dyn_arch_init(void)
> {
> - *(unsigned long *) data = 0;
> return 0;
> }
>
> diff --git a/arch/sh/kernel/ftrace.c b/arch/sh/kernel/ftrace.c
> index 30e1319..3c74f53 100644
> --- a/arch/sh/kernel/ftrace.c
> +++ b/arch/sh/kernel/ftrace.c
> @@ -272,11 +272,8 @@ int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
> return ftrace_modify_code(rec->ip, old, new);
> }
>
> -int __init ftrace_dyn_arch_init(void *data)
> +int __init ftrace_dyn_arch_init(void)
> {
> - /* The return code is retured via data */
> - __raw_writel(0, (unsigned long)data);
> -
> return 0;
> }
> #endif /* CONFIG_DYNAMIC_FTRACE */
> diff --git a/arch/sparc/kernel/ftrace.c b/arch/sparc/kernel/ftrace.c
> index 03ab022..0a2d2dd 100644
> --- a/arch/sparc/kernel/ftrace.c
> +++ b/arch/sparc/kernel/ftrace.c
> @@ -82,12 +82,8 @@ int ftrace_update_ftrace_func(ftrace_func_t func)
> return ftrace_modify_code(ip, old, new);
> }
>
> -int __init ftrace_dyn_arch_init(void *data)
> +int __init ftrace_dyn_arch_init(void)
> {
> - unsigned long *p = data;
> -
> - *p = 0;
> -
> return 0;
> }
> #endif
> diff --git a/arch/tile/kernel/ftrace.c b/arch/tile/kernel/ftrace.c
> index f1c4520..8d52d83 100644
> --- a/arch/tile/kernel/ftrace.c
> +++ b/arch/tile/kernel/ftrace.c
> @@ -167,10 +167,8 @@ int ftrace_make_nop(struct module *mod,
> return ret;
> }
>
> -int __init ftrace_dyn_arch_init(void *data)
> +int __init ftrace_dyn_arch_init(void)
> {
> - *(unsigned long *)data = 0;
> -
> return 0;
> }
> #endif /* CONFIG_DYNAMIC_FTRACE */
> diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c
> index e625319..52819e8 100644
> --- a/arch/x86/kernel/ftrace.c
> +++ b/arch/x86/kernel/ftrace.c
> @@ -308,7 +308,10 @@ static int ftrace_write(unsigned long ip, const char *val, int size)
> if (within(ip, (unsigned long)_text, (unsigned long)_etext))
> ip = (unsigned long)__va(__pa_symbol(ip));
>
> - return probe_kernel_write((void *)ip, val, size);
> + if (probe_kernel_write((void *)ip, val, size))
> + return -EPERM;
> +
> + return 0;
> }
>
> static int add_break(unsigned long ip, const char *old)
> @@ -323,10 +326,7 @@ static int add_break(unsigned long ip, const char *old)
> if (memcmp(replaced, old, MCOUNT_INSN_SIZE) != 0)
> return -EINVAL;
>
> - if (ftrace_write(ip, &brk, 1))
> - return -EPERM;
> -
> - return 0;
> + return ftrace_write(ip, &brk, 1);
> }
>
> static int add_brk_on_call(struct dyn_ftrace *rec, unsigned long addr)
> @@ -425,7 +425,7 @@ static int remove_breakpoint(struct dyn_ftrace *rec)
>
> /* If this does not have a breakpoint, we are done */
> if (ins[0] != brk)
> - return -1;
> + return 0;
>
> nop = ftrace_nop_replace();
>
> @@ -455,7 +455,7 @@ static int remove_breakpoint(struct dyn_ftrace *rec)
> }
>
> update:
> - return probe_kernel_write((void *)ip, &nop[0], 1);
> + return ftrace_write(ip, nop, 1);
> }
>
> static int add_update_code(unsigned long ip, unsigned const char *new)
> @@ -463,9 +463,7 @@ static int add_update_code(unsigned long ip, unsigned const char *new)
> /* skip breakpoint */
> ip++;
> new++;
> - if (ftrace_write(ip, new, MCOUNT_INSN_SIZE - 1))
> - return -EPERM;
> - return 0;
> + return ftrace_write(ip, new, MCOUNT_INSN_SIZE - 1);
> }
>
> static int add_update_call(struct dyn_ftrace *rec, unsigned long addr)
> @@ -520,10 +518,7 @@ static int finish_update_call(struct dyn_ftrace *rec, unsigned long addr)
>
> new = ftrace_call_replace(ip, addr);
>
> - if (ftrace_write(ip, new, 1))
> - return -EPERM;
> -
> - return 0;
> + return ftrace_write(ip, new, 1);
> }
>
> static int finish_update_nop(struct dyn_ftrace *rec)
> @@ -533,9 +528,7 @@ static int finish_update_nop(struct dyn_ftrace *rec)
>
> new = ftrace_nop_replace();
>
> - if (ftrace_write(ip, new, 1))
> - return -EPERM;
> - return 0;
> + return ftrace_write(ip, new, 1);
> }
>
> static int finish_update(struct dyn_ftrace *rec, int enable)
> @@ -632,8 +625,14 @@ void ftrace_replace_code(int enable)
> printk(KERN_WARNING "Failed on %s (%d):\n", report, count);
> for_ftrace_rec_iter(iter) {
> rec = ftrace_rec_iter_record(iter);
> - remove_breakpoint(rec);
> + /*
> + * Breakpoints are handled only when this function is in
> + * progress. The system could not work with them.
> + */
> + if (remove_breakpoint(rec))
> + BUG();
> }
> + run_sync();
> }
>
> static int
> @@ -655,16 +654,19 @@ ftrace_modify_code(unsigned long ip, unsigned const char *old_code,
> run_sync();
>
> ret = ftrace_write(ip, new_code, 1);
> - if (ret) {
> - ret = -EPERM;
> - goto out;
> - }
> - run_sync();
> + /*
> + * The breakpoint is handled only when this function is in progress.
> + * The system could not work if we could not remove it.
> + */
> + BUG_ON(ret);
> out:
> + run_sync();
> return ret;
>
> fail_update:
> - probe_kernel_write((void *)ip, &old_code[0], 1);
> + /* Also here the system could not work with the breakpoint */
> + if (ftrace_write(ip, old_code, 1))
> + BUG();
> goto out;
> }
>
> @@ -678,11 +680,8 @@ void arch_ftrace_update_code(int command)
> atomic_dec(&modifying_ftrace_code);
> }
>
> -int __init ftrace_dyn_arch_init(void *data)
> +int __init ftrace_dyn_arch_init(void)
> {
> - /* The return code is retured via data */
> - *(unsigned long *)data = 0;
> -
> return 0;
> }
> #endif
> diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
> index f4233b1..9212b01 100644
> --- a/include/linux/ftrace.h
> +++ b/include/linux/ftrace.h
> @@ -92,6 +92,7 @@ typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip,
> * STUB - The ftrace_ops is just a place holder.
> * INITIALIZED - The ftrace_ops has already been initialized (first use time
> * register_ftrace_function() is called, it will initialized the ops)
> + * DELETED - The ops are being deleted, do not let them be registered again.
> */
> enum {
> FTRACE_OPS_FL_ENABLED = 1 << 0,
> @@ -103,13 +104,26 @@ enum {
> FTRACE_OPS_FL_RECURSION_SAFE = 1 << 6,
> FTRACE_OPS_FL_STUB = 1 << 7,
> FTRACE_OPS_FL_INITIALIZED = 1 << 8,
> + FTRACE_OPS_FL_DELETED = 1 << 9,
> };
>
> +/*
> + * Note, ftrace_ops can be referenced outside of RCU protection.
> + * (Although, for perf, the control ops prevent that). If ftrace_ops is
> + * allocated and not part of kernel core data, the unregistering of it will
> + * perform a scheduling on all CPUs to make sure that there are no more users.
> + * Depending on the load of the system that may take a bit of time.
> + *
> + * Any private data added must also take care not to be freed and if private
> + * data is added to a ftrace_ops that is in core code, the user of the
> + * ftrace_ops must perform a schedule_on_each_cpu() before freeing it.
> + */
> struct ftrace_ops {
> ftrace_func_t func;
> struct ftrace_ops *next;
> unsigned long flags;
> int __percpu *disabled;
> + void *private;
> #ifdef CONFIG_DYNAMIC_FTRACE
> struct ftrace_hash *notrace_hash;
> struct ftrace_hash *filter_hash;
> @@ -285,7 +299,7 @@ extern void
> unregister_ftrace_function_probe_func(char *glob, struct ftrace_probe_ops *ops);
> extern void unregister_ftrace_function_probe_all(char *glob);
>
> -extern int ftrace_text_reserved(void *start, void *end);
> +extern int ftrace_text_reserved(const void *start, const void *end);
>
> extern int ftrace_nr_registered_ops(void);
>
> @@ -316,12 +330,9 @@ enum {
> #define FTRACE_REF_MAX ((1UL << 29) - 1)
>
> struct dyn_ftrace {
> - union {
> - unsigned long ip; /* address of mcount call-site */
> - struct dyn_ftrace *freelist;
> - };
> + unsigned long ip; /* address of mcount call-site */
> unsigned long flags;
> - struct dyn_arch_ftrace arch;
> + struct dyn_arch_ftrace arch;
> };
>
> int ftrace_force_update(void);
> @@ -409,7 +420,7 @@ ftrace_set_early_filter(struct ftrace_ops *ops, char *buf, int enable);
>
> /* defined in arch */
> extern int ftrace_ip_converted(unsigned long ip);
> -extern int ftrace_dyn_arch_init(void *data);
> +extern int ftrace_dyn_arch_init(void);
> extern void ftrace_replace_code(int enable);
> extern int ftrace_update_ftrace_func(ftrace_func_t func);
> extern void ftrace_caller(void);
> @@ -541,7 +552,7 @@ static inline __init int unregister_ftrace_command(char *cmd_name)
> {
> return -EINVAL;
> }
> -static inline int ftrace_text_reserved(void *start, void *end)
> +static inline int ftrace_text_reserved(const void *start, const void *end)
> {
> return 0;
> }
> diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h
> index 4e4cc28..cdc9759 100644
> --- a/include/linux/ftrace_event.h
> +++ b/include/linux/ftrace_event.h
> @@ -163,6 +163,8 @@ void trace_current_buffer_discard_commit(struct ring_buffer *buffer,
>
> void tracing_record_cmdline(struct task_struct *tsk);
>
> +int ftrace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...);
> +
> struct event_filter;
>
> enum trace_reg {
> @@ -197,6 +199,32 @@ struct ftrace_event_class {
> extern int ftrace_event_reg(struct ftrace_event_call *event,
> enum trace_reg type, void *data);
>
> +int ftrace_output_event(struct trace_iterator *iter, struct ftrace_event_call *event,
> + char *fmt, ...);
> +
> +int ftrace_event_define_field(struct ftrace_event_call *call,
> + char *type, int len, char *item, int offset,
> + int field_size, int sign, int filter);
> +
> +struct ftrace_event_buffer {
> + struct ring_buffer *buffer;
> + struct ring_buffer_event *event;
> + struct ftrace_event_file *ftrace_file;
> + void *entry;
> + unsigned long flags;
> + int pc;
> +};
> +
> +void *ftrace_event_buffer_reserve(struct ftrace_event_buffer *fbuffer,
> + struct ftrace_event_file *ftrace_file,
> + unsigned long len);
> +
> +void ftrace_event_buffer_commit(struct ftrace_event_buffer *fbuffer);
> +
> +int ftrace_event_define_field(struct ftrace_event_call *call,
> + char *type, int len, char *item, int offset,
> + int field_size, int sign, int filter);
> +
> enum {
> TRACE_EVENT_FL_FILTERED_BIT,
> TRACE_EVENT_FL_CAP_ANY_BIT,
> diff --git a/include/linux/module.h b/include/linux/module.h
> index eaf60ff..5a50539 100644
> --- a/include/linux/module.h
> +++ b/include/linux/module.h
> @@ -15,7 +15,7 @@
> #include <linux/stringify.h>
> #include <linux/kobject.h>
> #include <linux/moduleparam.h>
> -#include <linux/tracepoint.h>
> +#include <linux/jump_label.h>
> #include <linux/export.h>
>
> #include <linux/percpu.h>
> diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
> index accc497..a3b2837 100644
> --- a/include/linux/tracepoint.h
> +++ b/include/linux/tracepoint.h
> @@ -48,12 +48,6 @@ extern int tracepoint_probe_register(const char *name, void *probe, void *data);
> extern int
> tracepoint_probe_unregister(const char *name, void *probe, void *data);
>
> -extern int tracepoint_probe_register_noupdate(const char *name, void *probe,
> - void *data);
> -extern int tracepoint_probe_unregister_noupdate(const char *name, void *probe,
> - void *data);
> -extern void tracepoint_probe_update_all(void);
> -
> #ifdef CONFIG_MODULES
> struct tp_module {
> struct list_head list;
> @@ -62,18 +56,6 @@ struct tp_module {
> };
> #endif /* CONFIG_MODULES */
>
> -struct tracepoint_iter {
> -#ifdef CONFIG_MODULES
> - struct tp_module *module;
> -#endif /* CONFIG_MODULES */
> - struct tracepoint * const *tracepoint;
> -};
> -
> -extern void tracepoint_iter_start(struct tracepoint_iter *iter);
> -extern void tracepoint_iter_next(struct tracepoint_iter *iter);
> -extern void tracepoint_iter_stop(struct tracepoint_iter *iter);
> -extern void tracepoint_iter_reset(struct tracepoint_iter *iter);
> -
> /*
> * tracepoint_synchronize_unregister must be called between the last tracepoint
> * probe unregistration and the end of module exit to make sure there is no
> diff --git a/include/trace/events/migrate.h b/include/trace/events/migrate.h
> index 3075ffb..4e4f2f8 100644
> --- a/include/trace/events/migrate.h
> +++ b/include/trace/events/migrate.h
> @@ -4,6 +4,8 @@
> #if !defined(_TRACE_MIGRATE_H) || defined(TRACE_HEADER_MULTI_READ)
> #define _TRACE_MIGRATE_H
>
> +#include <linux/tracepoint.h>
> +
> #define MIGRATE_MODE \
> {MIGRATE_ASYNC, "MIGRATE_ASYNC"}, \
> {MIGRATE_SYNC_LIGHT, "MIGRATE_SYNC_LIGHT"}, \
> diff --git a/include/trace/events/writeback.h b/include/trace/events/writeback.h
> index c7bbbe7..309a086 100644
> --- a/include/trace/events/writeback.h
> +++ b/include/trace/events/writeback.h
> @@ -4,6 +4,7 @@
> #if !defined(_TRACE_WRITEBACK_H) || defined(TRACE_HEADER_MULTI_READ)
> #define _TRACE_WRITEBACK_H
>
> +#include <linux/tracepoint.h>
> #include <linux/backing-dev.h>
> #include <linux/writeback.h>
>
> diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h
> index 1a8b28d..d1d9187 100644
> --- a/include/trace/ftrace.h
> +++ b/include/trace/ftrace.h
> @@ -265,11 +265,9 @@ static notrace enum print_line_t \
> ftrace_raw_output_##call(struct trace_iterator *iter, int flags, \
> struct trace_event *event) \
> { \
> - struct trace_seq *s = &iter->seq; \
> struct ftrace_raw_##template *field; \
> struct trace_entry *entry; \
> struct trace_seq *p = &iter->tmp_seq; \
> - int ret; \
> \
> entry = iter->ent; \
> \
> @@ -281,13 +279,7 @@ ftrace_raw_output_##call(struct trace_iterator *iter, int flags, \
> field = (typeof(field))entry; \
> \
> trace_seq_init(p); \
> - ret = trace_seq_printf(s, "%s: ", #call); \
> - if (ret) \
> - ret = trace_seq_printf(s, print); \
> - if (!ret) \
> - return TRACE_TYPE_PARTIAL_LINE; \
> - \
> - return TRACE_TYPE_HANDLED; \
> + return ftrace_output_call(iter, #call, print); \
> } \
> static struct trace_event_functions ftrace_event_type_funcs_##call = { \
> .trace = ftrace_raw_output_##call, \
> @@ -373,10 +365,11 @@ ftrace_define_fields_##call(struct ftrace_event_call *event_call) \
>
> #undef __dynamic_array
> #define __dynamic_array(type, item, len) \
> + __item_length = (len) * sizeof(type); \
> __data_offsets->item = __data_size + \
> offsetof(typeof(*entry), __data); \
> - __data_offsets->item |= (len * sizeof(type)) << 16; \
> - __data_size += (len) * sizeof(type);
> + __data_offsets->item |= __item_length << 16; \
> + __data_size += __item_length;
>
> #undef __string
> #define __string(item, src) __dynamic_array(char, item, \
> @@ -388,6 +381,7 @@ static inline notrace int ftrace_get_offsets_##call( \
> struct ftrace_data_offsets_##call *__data_offsets, proto) \
> { \
> int __data_size = 0; \
> + int __maybe_unused __item_length; \
> struct ftrace_raw_##call __maybe_unused *entry; \
> \
> tstruct; \
> @@ -544,37 +538,27 @@ static notrace void \
> ftrace_raw_event_##call(void *__data, proto) \
> { \
> struct ftrace_event_file *ftrace_file = __data; \
> - struct ftrace_event_call *event_call = ftrace_file->event_call; \
> struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
> - struct ring_buffer_event *event; \
> + struct ftrace_event_buffer fbuffer; \
> struct ftrace_raw_##call *entry; \
> - struct ring_buffer *buffer; \
> - unsigned long irq_flags; \
> int __data_size; \
> - int pc; \
> \
> if (ftrace_trigger_soft_disabled(ftrace_file)) \
> return; \
> \
> - local_save_flags(irq_flags); \
> - pc = preempt_count(); \
> - \
> __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
> \
> - event = trace_event_buffer_lock_reserve(&buffer, ftrace_file, \
> - event_call->event.type, \
> - sizeof(*entry) + __data_size, \
> - irq_flags, pc); \
> - if (!event) \
> + entry = ftrace_event_buffer_reserve(&fbuffer, ftrace_file, \
> + sizeof(*entry) + __data_size); \
> + \
> + if (!entry) \
> return; \
> - entry = ring_buffer_event_data(event); \
> \
> tstruct \
> \
> { assign; } \
> \
> - event_trigger_unlock_commit(ftrace_file, buffer, event, entry, \
> - irq_flags, pc); \
> + ftrace_event_buffer_commit(&fbuffer); \
> }
> /*
> * The ftrace_test_probe is compiled out, it is only here as a build time check
> diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
> index b418cb0..0d758ca 100644
> --- a/kernel/trace/blktrace.c
> +++ b/kernel/trace/blktrace.c
> @@ -1427,7 +1427,8 @@ static enum print_line_t blk_tracer_print_line(struct trace_iterator *iter)
> return print_one_line(iter, true);
> }
>
> -static int blk_tracer_set_flag(u32 old_flags, u32 bit, int set)
> +static int
> +blk_tracer_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set)
> {
> /* don't output context-info for blk_classic output */
> if (bit == TRACE_BLK_OPT_CLASSIC) {
> diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
> index cd7f76d..1fd4b94 100644
> --- a/kernel/trace/ftrace.c
> +++ b/kernel/trace/ftrace.c
> @@ -237,14 +237,13 @@ static int control_ops_alloc(struct ftrace_ops *ops)
> return 0;
> }
>
> -static void control_ops_free(struct ftrace_ops *ops)
> -{
> - free_percpu(ops->disabled);
> -}
> -
> static void update_global_ops(void)
> {
> - ftrace_func_t func;
> + ftrace_func_t func = ftrace_global_list_func;
> + void *private = NULL;
> +
> + /* The list has its own recursion protection. */
> + global_ops.flags |= FTRACE_OPS_FL_RECURSION_SAFE;
>
> /*
> * If there's only one function registered, then call that
> @@ -254,23 +253,17 @@ static void update_global_ops(void)
> if (ftrace_global_list == &ftrace_list_end ||
> ftrace_global_list->next == &ftrace_list_end) {
> func = ftrace_global_list->func;
> + private = ftrace_global_list->private;
> /*
> * As we are calling the function directly.
> * If it does not have recursion protection,
> * the function_trace_op needs to be updated
> * accordingly.
> */
> - if (ftrace_global_list->flags & FTRACE_OPS_FL_RECURSION_SAFE)
> - global_ops.flags |= FTRACE_OPS_FL_RECURSION_SAFE;
> - else
> + if (!(ftrace_global_list->flags & FTRACE_OPS_FL_RECURSION_SAFE))
> global_ops.flags &= ~FTRACE_OPS_FL_RECURSION_SAFE;
> - } else {
> - func = ftrace_global_list_func;
> - /* The list has its own recursion protection. */
> - global_ops.flags |= FTRACE_OPS_FL_RECURSION_SAFE;
> }
>
> -
> /* If we filter on pids, update to use the pid function */
> if (!list_empty(&ftrace_pids)) {
> set_ftrace_pid_function(func);
> @@ -278,6 +271,7 @@ static void update_global_ops(void)
> }
>
> global_ops.func = func;
> + global_ops.private = private;
> }
>
> static void ftrace_sync(struct work_struct *work)
> @@ -437,6 +431,9 @@ static int remove_ftrace_list_ops(struct ftrace_ops **list,
>
> static int __register_ftrace_function(struct ftrace_ops *ops)
> {
> + if (ops->flags & FTRACE_OPS_FL_DELETED)
> + return -EINVAL;
> +
> if (FTRACE_WARN_ON(ops == &global_ops))
> return -EINVAL;
>
> @@ -1172,8 +1169,6 @@ struct ftrace_page {
> int size;
> };
>
> -static struct ftrace_page *ftrace_new_pgs;
> -
> #define ENTRY_SIZE sizeof(struct dyn_ftrace)
> #define ENTRIES_PER_PAGE (PAGE_SIZE / ENTRY_SIZE)
>
> @@ -1560,7 +1555,7 @@ unsigned long ftrace_location(unsigned long ip)
> * the function tracer. It checks the ftrace internal tables to
> * determine if the address belongs or not.
> */
> -int ftrace_text_reserved(void *start, void *end)
> +int ftrace_text_reserved(const void *start, const void *end)
> {
> unsigned long ret;
>
> @@ -1994,6 +1989,7 @@ int __weak ftrace_arch_code_modify_post_process(void)
> void ftrace_modify_all_code(int command)
> {
> int update = command & FTRACE_UPDATE_TRACE_FUNC;
> + int err = 0;
>
> /*
> * If the ftrace_caller calls a ftrace_ops func directly,
> @@ -2005,8 +2001,11 @@ void ftrace_modify_all_code(int command)
> * to make sure the ops are having the right functions
> * traced.
> */
> - if (update)
> - ftrace_update_ftrace_func(ftrace_ops_list_func);
> + if (update) {
> + err = ftrace_update_ftrace_func(ftrace_ops_list_func);
> + if (FTRACE_WARN_ON(err))
> + return;
> + }
>
> if (command & FTRACE_UPDATE_CALLS)
> ftrace_replace_code(1);
> @@ -2019,13 +2018,16 @@ void ftrace_modify_all_code(int command)
> /* If irqs are disabled, we are in stop machine */
> if (!irqs_disabled())
> smp_call_function(ftrace_sync_ipi, NULL, 1);
> - ftrace_update_ftrace_func(ftrace_trace_function);
> + err = ftrace_update_ftrace_func(ftrace_trace_function);
> + if (FTRACE_WARN_ON(err))
> + return;
> }
>
> if (command & FTRACE_START_FUNC_RET)
> - ftrace_enable_ftrace_graph_caller();
> + err = ftrace_enable_ftrace_graph_caller();
> else if (command & FTRACE_STOP_FUNC_RET)
> - ftrace_disable_ftrace_graph_caller();
> + err = ftrace_disable_ftrace_graph_caller();
> + FTRACE_WARN_ON(err);
> }
>
> static int __ftrace_modify_code(void *data)
> @@ -2093,6 +2095,11 @@ static ftrace_func_t saved_ftrace_func;
> static int ftrace_start_up;
> static int global_start_up;
>
> +static void control_ops_free(struct ftrace_ops *ops)
> +{
> + free_percpu(ops->disabled);
> +}
> +
> static void ftrace_startup_enable(int command)
> {
> if (saved_ftrace_func != ftrace_trace_function) {
> @@ -2244,7 +2251,6 @@ static void ftrace_shutdown_sysctl(void)
> }
>
> static cycle_t ftrace_update_time;
> -static unsigned long ftrace_update_cnt;
> unsigned long ftrace_update_tot_cnt;
>
> static inline int ops_traces_mod(struct ftrace_ops *ops)
> @@ -2300,11 +2306,12 @@ static int referenced_filters(struct dyn_ftrace *rec)
> return cnt;
> }
>
> -static int ftrace_update_code(struct module *mod)
> +static int ftrace_update_code(struct module *mod, struct ftrace_page *new_pgs)
> {
> struct ftrace_page *pg;
> struct dyn_ftrace *p;
> cycle_t start, stop;
> + unsigned long update_cnt = 0;
> unsigned long ref = 0;
> bool test = false;
> int i;
> @@ -2330,9 +2337,8 @@ static int ftrace_update_code(struct module *mod)
> }
>
> start = ftrace_now(raw_smp_processor_id());
> - ftrace_update_cnt = 0;
>
> - for (pg = ftrace_new_pgs; pg; pg = pg->next) {
> + for (pg = new_pgs; pg; pg = pg->next) {
>
> for (i = 0; i < pg->index; i++) {
> int cnt = ref;
> @@ -2353,7 +2359,7 @@ static int ftrace_update_code(struct module *mod)
> if (!ftrace_code_disable(mod, p))
> break;
>
> - ftrace_update_cnt++;
> + update_cnt++;
>
> /*
> * If the tracing is enabled, go ahead and enable the record.
> @@ -2372,11 +2378,9 @@ static int ftrace_update_code(struct module *mod)
> }
> }
>
> - ftrace_new_pgs = NULL;
> -
> stop = ftrace_now(raw_smp_processor_id());
> ftrace_update_time = stop - start;
> - ftrace_update_tot_cnt += ftrace_update_cnt;
> + ftrace_update_tot_cnt += update_cnt;
>
> return 0;
> }
> @@ -2468,22 +2472,6 @@ ftrace_allocate_pages(unsigned long num_to_init)
> return NULL;
> }
>
> -static int __init ftrace_dyn_table_alloc(unsigned long num_to_init)
> -{
> - int cnt;
> -
> - if (!num_to_init) {
> - pr_info("ftrace: No functions to be traced?\n");
> - return -1;
> - }
> -
> - cnt = num_to_init / ENTRIES_PER_PAGE;
> - pr_info("ftrace: allocating %ld entries in %d pages\n",
> - num_to_init, cnt + 1);
> -
> - return 0;
> -}
> -
> #define FTRACE_BUFF_MAX (KSYM_SYMBOL_LEN+4) /* room for wildcards */
>
> struct ftrace_iterator {
> @@ -2871,7 +2859,9 @@ ftrace_regex_open(struct ftrace_ops *ops, int flag,
> static int
> ftrace_filter_open(struct inode *inode, struct file *file)
> {
> - return ftrace_regex_open(&global_ops,
> + struct ftrace_ops *ops = inode->i_private;
> +
> + return ftrace_regex_open(ops,
> FTRACE_ITER_FILTER | FTRACE_ITER_DO_HASH,
> inode, file);
> }
> @@ -2879,7 +2869,9 @@ ftrace_filter_open(struct inode *inode, struct file *file)
> static int
> ftrace_notrace_open(struct inode *inode, struct file *file)
> {
> - return ftrace_regex_open(&global_ops, FTRACE_ITER_NOTRACE,
> + struct ftrace_ops *ops = inode->i_private;
> +
> + return ftrace_regex_open(ops, FTRACE_ITER_NOTRACE,
> inode, file);
> }
>
> @@ -4109,6 +4101,36 @@ static const struct file_operations ftrace_graph_notrace_fops = {
> };
> #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
>
> +void ftrace_create_filter_files(struct ftrace_ops *ops,
> + struct dentry *parent)
> +{
> +
> + trace_create_file("set_ftrace_filter", 0644, parent,
> + ops, &ftrace_filter_fops);
> +
> + trace_create_file("set_ftrace_notrace", 0644, parent,
> + ops, &ftrace_notrace_fops);
> +}
> +
> +/*
> + * The name "destroy_filter_files" is really a misnomer. Although
> + * in the future, it may actualy delete the files, but this is
> + * really intended to make sure the ops passed in are disabled
> + * and that when this function returns, the caller is free to
> + * free the ops.
> + *
> + * The "destroy" name is only to match the "create" name that this
> + * should be paired with.
> + */
> +void ftrace_destroy_filter_files(struct ftrace_ops *ops)
> +{
> + mutex_lock(&ftrace_lock);
> + if (ops->flags & FTRACE_OPS_FL_ENABLED)
> + ftrace_shutdown(ops, 0);
> + ops->flags |= FTRACE_OPS_FL_DELETED;
> + mutex_unlock(&ftrace_lock);
> +}
> +
> static __init int ftrace_init_dyn_debugfs(struct dentry *d_tracer)
> {
>
> @@ -4118,11 +4140,7 @@ static __init int ftrace_init_dyn_debugfs(struct dentry *d_tracer)
> trace_create_file("enabled_functions", 0444,
> d_tracer, NULL, &ftrace_enabled_fops);
>
> - trace_create_file("set_ftrace_filter", 0644, d_tracer,
> - NULL, &ftrace_filter_fops);
> -
> - trace_create_file("set_ftrace_notrace", 0644, d_tracer,
> - NULL, &ftrace_notrace_fops);
> + ftrace_create_filter_files(&global_ops, d_tracer);
>
> #ifdef CONFIG_FUNCTION_GRAPH_TRACER
> trace_create_file("set_graph_function", 0444, d_tracer,
> @@ -4238,9 +4256,6 @@ static int ftrace_process_locs(struct module *mod,
> /* Assign the last page to ftrace_pages */
> ftrace_pages = pg;
>
> - /* These new locations need to be initialized */
> - ftrace_new_pgs = start_pg;
> -
> /*
> * We only need to disable interrupts on start up
> * because we are modifying code that an interrupt
> @@ -4251,7 +4266,7 @@ static int ftrace_process_locs(struct module *mod,
> */
> if (!mod)
> local_irq_save(flags);
> - ftrace_update_code(mod);
> + ftrace_update_code(mod, start_pg);
> if (!mod)
> local_irq_restore(flags);
> ret = 0;
> @@ -4360,30 +4375,27 @@ struct notifier_block ftrace_module_exit_nb = {
> .priority = INT_MIN, /* Run after anything that can remove kprobes */
> };
>
> -extern unsigned long __start_mcount_loc[];
> -extern unsigned long __stop_mcount_loc[];
> -
> void __init ftrace_init(void)
> {
> - unsigned long count, addr, flags;
> + extern unsigned long __start_mcount_loc[];
> + extern unsigned long __stop_mcount_loc[];
> + unsigned long count, flags;
> int ret;
>
> - /* Keep the ftrace pointer to the stub */
> - addr = (unsigned long)ftrace_stub;
> -
> local_irq_save(flags);
> - ftrace_dyn_arch_init(&addr);
> + ret = ftrace_dyn_arch_init();
> local_irq_restore(flags);
> -
> - /* ftrace_dyn_arch_init places the return code in addr */
> - if (addr)
> + if (ret)
> goto failed;
>
> count = __stop_mcount_loc - __start_mcount_loc;
> -
> - ret = ftrace_dyn_table_alloc(count);
> - if (ret)
> + if (!count) {
> + pr_info("ftrace: No functions to be traced?\n");
> goto failed;
> + }
> +
> + pr_info("ftrace: allocating %ld entries in %ld pages\n",
> + count, count / ENTRIES_PER_PAGE + 1);
>
> last_ftrace_enabled = ftrace_enabled = 1;
>
> @@ -4431,7 +4443,13 @@ static inline void ftrace_startup_enable(int command) { }
> (ops)->flags |= FTRACE_OPS_FL_ENABLED; \
> ___ret; \
> })
> -# define ftrace_shutdown(ops, command) __unregister_ftrace_function(ops)
> +# define ftrace_shutdown(ops, command) \
> + ({ \
> + int ___ret = __unregister_ftrace_function(ops); \
> + if (!___ret) \
> + (ops)->flags &= ~FTRACE_OPS_FL_ENABLED; \
> + ___ret; \
> + })
>
> # define ftrace_startup_sysctl() do { } while (0)
> # define ftrace_shutdown_sysctl() do { } while (0)
> diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
> index 815c878..c90f55d 100644
> --- a/kernel/trace/trace.c
> +++ b/kernel/trace/trace.c
> @@ -73,7 +73,8 @@ static struct tracer_flags dummy_tracer_flags = {
> .opts = dummy_tracer_opt
> };
>
> -static int dummy_set_flag(u32 old_flags, u32 bit, int set)
> +static int
> +dummy_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set)
> {
> return 0;
> }
> @@ -118,7 +119,7 @@ enum ftrace_dump_mode ftrace_dump_on_oops;
> /* When set, tracing will stop when a WARN*() is hit */
> int __disable_trace_on_warning;
>
> -static int tracing_set_tracer(const char *buf);
> +static int tracing_set_tracer(struct trace_array *tr, const char *buf);
>
> #define MAX_TRACER_SIZE 100
> static char bootup_tracer_buf[MAX_TRACER_SIZE] __initdata;
> @@ -180,6 +181,17 @@ static int __init set_trace_boot_options(char *str)
> }
> __setup("trace_options=", set_trace_boot_options);
>
> +static char trace_boot_clock_buf[MAX_TRACER_SIZE] __initdata;
> +static char *trace_boot_clock __initdata;
> +
> +static int __init set_trace_boot_clock(char *str)
> +{
> + strlcpy(trace_boot_clock_buf, str, MAX_TRACER_SIZE);
> + trace_boot_clock = trace_boot_clock_buf;
> + return 0;
> +}
> +__setup("trace_clock=", set_trace_boot_clock);
> +
>
> unsigned long long ns2usecs(cycle_t nsec)
> {
> @@ -1230,7 +1242,7 @@ int register_tracer(struct tracer *type)
>
> printk(KERN_INFO "Starting tracer '%s'\n", type->name);
> /* Do we want this tracer to start on bootup? */
> - tracing_set_tracer(type->name);
> + tracing_set_tracer(&global_trace, type->name);
> default_bootup_tracer = NULL;
> /* disable other selftests, since this will break it. */
> tracing_selftest_disabled = true;
> @@ -3121,27 +3133,52 @@ static int tracing_open(struct inode *inode, struct file *file)
> return ret;
> }
>
> +/*
> + * Some tracers are not suitable for instance buffers.
> + * A tracer is always available for the global array (toplevel)
> + * or if it explicitly states that it is.
> + */
> +static bool
> +trace_ok_for_array(struct tracer *t, struct trace_array *tr)
> +{
> + return (tr->flags & TRACE_ARRAY_FL_GLOBAL) || t->allow_instances;
> +}
> +
> +/* Find the next tracer that this trace array may use */
> +static struct tracer *
> +get_tracer_for_array(struct trace_array *tr, struct tracer *t)
> +{
> + while (t && !trace_ok_for_array(t, tr))
> + t = t->next;
> +
> + return t;
> +}
> +
> static void *
> t_next(struct seq_file *m, void *v, loff_t *pos)
> {
> + struct trace_array *tr = m->private;
> struct tracer *t = v;
>
> (*pos)++;
>
> if (t)
> - t = t->next;
> + t = get_tracer_for_array(tr, t->next);
>
> return t;
> }
>
> static void *t_start(struct seq_file *m, loff_t *pos)
> {
> + struct trace_array *tr = m->private;
> struct tracer *t;
> loff_t l = 0;
>
> mutex_lock(&trace_types_lock);
> - for (t = trace_types; t && l < *pos; t = t_next(m, t, &l))
> - ;
> +
> + t = get_tracer_for_array(tr, trace_types);
> + for (; t && l < *pos; t = t_next(m, t, &l))
> + ;
>
> return t;
> }
> @@ -3176,10 +3213,21 @@ static const struct seq_operations show_traces_seq_ops = {
>
> static int show_traces_open(struct inode *inode, struct file *file)
> {
> + struct trace_array *tr = inode->i_private;
> + struct seq_file *m;
> + int ret;
> +
> if (tracing_disabled)
> return -ENODEV;
>
> - return seq_open(file, &show_traces_seq_ops);
> + ret = seq_open(file, &show_traces_seq_ops);
> + if (ret)
> + return ret;
> +
> + m = file->private_data;
> + m->private = tr;
> +
> + return 0;
> }
>
> static ssize_t
> @@ -3339,13 +3387,14 @@ static int tracing_trace_options_show(struct seq_file *m, void *v)
> return 0;
> }
>
> -static int __set_tracer_option(struct tracer *trace,
> +static int __set_tracer_option(struct trace_array *tr,
> struct tracer_flags *tracer_flags,
> struct tracer_opt *opts, int neg)
> {
> + struct tracer *trace = tr->current_trace;
> int ret;
>
> - ret = trace->set_flag(tracer_flags->val, opts->bit, !neg);
> + ret = trace->set_flag(tr, tracer_flags->val, opts->bit, !neg);
> if (ret)
> return ret;
>
> @@ -3357,8 +3406,9 @@ static int __set_tracer_option(struct tracer *trace,
> }
>
> /* Try to assign a tracer specific option */
> -static int set_tracer_option(struct tracer *trace, char *cmp, int neg)
> +static int set_tracer_option(struct trace_array *tr, char *cmp, int neg)
> {
> + struct tracer *trace = tr->current_trace;
> struct tracer_flags *tracer_flags = trace->flags;
> struct tracer_opt *opts = NULL;
> int i;
> @@ -3367,8 +3417,7 @@ static int set_tracer_option(struct tracer *trace, char *cmp, int neg)
> opts = &tracer_flags->opts[i];
>
> if (strcmp(cmp, opts->name) == 0)
> - return __set_tracer_option(trace, trace->flags,
> - opts, neg);
> + return __set_tracer_option(tr, trace->flags, opts, neg);
> }
>
> return -EINVAL;
> @@ -3391,7 +3440,7 @@ int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled)
>
> /* Give the tracer a chance to approve the change */
> if (tr->current_trace->flag_changed)
> - if (tr->current_trace->flag_changed(tr->current_trace, mask, !!enabled))
> + if (tr->current_trace->flag_changed(tr, mask, !!enabled))
> return -EINVAL;
>
> if (enabled)
> @@ -3440,7 +3489,7 @@ static int trace_set_options(struct trace_array *tr, char *option)
>
> /* If no option could be set, test the specific tracer options */
> if (!trace_options[i])
> - ret = set_tracer_option(tr->current_trace, cmp, neg);
> + ret = set_tracer_option(tr, cmp, neg);
>
> mutex_unlock(&trace_types_lock);
>
> @@ -3869,10 +3918,26 @@ create_trace_option_files(struct trace_array *tr, struct tracer *tracer);
> static void
> destroy_trace_option_files(struct trace_option_dentry *topts);
>
> -static int tracing_set_tracer(const char *buf)
> +/*
> + * Used to clear out the tracer before deletion of an instance.
> + * Must have trace_types_lock held.
> + */
> +static void tracing_set_nop(struct trace_array *tr)
> +{
> + if (tr->current_trace == &nop_trace)
> + return;
> +
> + tr->current_trace->enabled--;
> +
> + if (tr->current_trace->reset)
> + tr->current_trace->reset(tr);
> +
> + tr->current_trace = &nop_trace;
> +}
> +
> +static int tracing_set_tracer(struct trace_array *tr, const char *buf)
> {
> static struct trace_option_dentry *topts;
> - struct trace_array *tr = &global_trace;
> struct tracer *t;
> #ifdef CONFIG_TRACER_MAX_TRACE
> bool had_max_tr;
> @@ -3900,9 +3965,15 @@ static int tracing_set_tracer(const char *buf)
> if (t == tr->current_trace)
> goto out;
>
> + /* Some tracers are only allowed for the top level buffer */
> + if (!trace_ok_for_array(t, tr)) {
> + ret = -EINVAL;
> + goto out;
> + }
> +
> trace_branch_disable();
>
> - tr->current_trace->enabled = false;
> + tr->current_trace->enabled--;
>
> if (tr->current_trace->reset)
> tr->current_trace->reset(tr);
> @@ -3925,9 +3996,11 @@ static int tracing_set_tracer(const char *buf)
> free_snapshot(tr);
> }
> #endif
> - destroy_trace_option_files(topts);
> -
> - topts = create_trace_option_files(tr, t);
> + /* Currently, only the top instance has options */
> + if (tr->flags & TRACE_ARRAY_FL_GLOBAL) {
> + destroy_trace_option_files(topts);
> + topts = create_trace_option_files(tr, t);
> + }
>
> #ifdef CONFIG_TRACER_MAX_TRACE
> if (t->use_max_tr && !had_max_tr) {
> @@ -3944,7 +4017,7 @@ static int tracing_set_tracer(const char *buf)
> }
>
> tr->current_trace = t;
> - tr->current_trace->enabled = true;
> + tr->current_trace->enabled++;
> trace_branch_enable(tr);
> out:
> mutex_unlock(&trace_types_lock);
> @@ -3956,6 +4029,7 @@ static ssize_t
> tracing_set_trace_write(struct file *filp, const char __user *ubuf,
> size_t cnt, loff_t *ppos)
> {
> + struct trace_array *tr = filp->private_data;
> char buf[MAX_TRACER_SIZE+1];
> int i;
> size_t ret;
> @@ -3975,7 +4049,7 @@ tracing_set_trace_write(struct file *filp, const char __user *ubuf,
> for (i = cnt - 1; i > 0 && isspace(buf[i]); i--)
> buf[i] = 0;
>
> - err = tracing_set_tracer(buf);
> + err = tracing_set_tracer(tr, buf);
> if (err)
> return err;
>
> @@ -4683,25 +4757,10 @@ static int tracing_clock_show(struct seq_file *m, void *v)
> return 0;
> }
>
> -static ssize_t tracing_clock_write(struct file *filp, const char __user *ubuf,
> - size_t cnt, loff_t *fpos)
> +static int tracing_set_clock(struct trace_array *tr, const char *clockstr)
> {
> - struct seq_file *m = filp->private_data;
> - struct trace_array *tr = m->private;
> - char buf[64];
> - const char *clockstr;
> int i;
>
> - if (cnt >= sizeof(buf))
> - return -EINVAL;
> -
> - if (copy_from_user(&buf, ubuf, cnt))
> - return -EFAULT;
> -
> - buf[cnt] = 0;
> -
> - clockstr = strstrip(buf);
> -
> for (i = 0; i < ARRAY_SIZE(trace_clocks); i++) {
> if (strcmp(trace_clocks[i].name, clockstr) == 0)
> break;
> @@ -4729,6 +4788,32 @@ static ssize_t tracing_clock_write(struct file *filp, const char __user *ubuf,
>
> mutex_unlock(&trace_types_lock);
>
> + return 0;
> +}
> +
> +static ssize_t tracing_clock_write(struct file *filp, const char __user *ubuf,
> + size_t cnt, loff_t *fpos)
> +{
> + struct seq_file *m = filp->private_data;
> + struct trace_array *tr = m->private;
> + char buf[64];
> + const char *clockstr;
> + int ret;
> +
> + if (cnt >= sizeof(buf))
> + return -EINVAL;
> +
> + if (copy_from_user(&buf, ubuf, cnt))
> + return -EFAULT;
> +
> + buf[cnt] = 0;
> +
> + clockstr = strstrip(buf);
> +
> + ret = tracing_set_clock(tr, clockstr);
> + if (ret)
> + return ret;
> +
> *fpos += cnt;
>
> return cnt;
> @@ -5689,7 +5774,7 @@ trace_options_write(struct file *filp, const char __user *ubuf, size_t cnt,
>
> if (!!(topt->flags->val & topt->opt->bit) != val) {
> mutex_lock(&trace_types_lock);
> - ret = __set_tracer_option(topt->tr->current_trace, topt->flags,
> + ret = __set_tracer_option(topt->tr, topt->flags,
> topt->opt, !val);
> mutex_unlock(&trace_types_lock);
> if (ret)
> @@ -6096,7 +6181,9 @@ static int instance_delete(const char *name)
>
> list_del(&tr->list);
>
> + tracing_set_nop(tr);
> event_trace_del_tracer(tr);
> + ftrace_destroy_function_files(tr);
> debugfs_remove_recursive(tr->dir);
> free_percpu(tr->trace_buffer.data);
> ring_buffer_free(tr->trace_buffer.buffer);
> @@ -6191,6 +6278,12 @@ init_tracer_debugfs(struct trace_array *tr, struct dentry *d_tracer)
> {
> int cpu;
>
> + trace_create_file("available_tracers", 0444, d_tracer,
> + tr, &show_traces_fops);
> +
> + trace_create_file("current_tracer", 0644, d_tracer,
> + tr, &set_tracer_fops);
> +
> trace_create_file("tracing_cpumask", 0644, d_tracer,
> tr, &tracing_cpumask_fops);
>
> @@ -6221,6 +6314,9 @@ init_tracer_debugfs(struct trace_array *tr, struct dentry *d_tracer)
> trace_create_file("tracing_on", 0644, d_tracer,
> tr, &rb_simple_fops);
>
> + if (ftrace_create_function_files(tr, d_tracer))
> + WARN(1, "Could not allocate function filter files");
> +
> #ifdef CONFIG_TRACER_SNAPSHOT
> trace_create_file("snapshot", 0644, d_tracer,
> tr, &snapshot_fops);
> @@ -6243,12 +6339,6 @@ static __init int tracer_init_debugfs(void)
>
> init_tracer_debugfs(&global_trace, d_tracer);
>
> - trace_create_file("available_tracers", 0444, d_tracer,
> - &global_trace, &show_traces_fops);
> -
> - trace_create_file("current_tracer", 0644, d_tracer,
> - &global_trace, &set_tracer_fops);
> -
> #ifdef CONFIG_TRACER_MAX_TRACE
> trace_create_file("tracing_max_latency", 0644, d_tracer,
> &tracing_max_latency, &tracing_max_lat_fops);
> @@ -6506,6 +6596,13 @@ __init static int tracer_alloc_buffers(void)
>
> trace_init_cmdlines();
>
> + if (trace_boot_clock) {
> + ret = tracing_set_clock(&global_trace, trace_boot_clock);
> + if (ret < 0)
> + pr_warning("Trace clock %s not defined, going back to default\n",
> + trace_boot_clock);
> + }
> +
> /*
> * register_tracer() might reference current_trace, so it
> * needs to be set before we register anything. This is
> diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
> index 02b592f..ffc314b 100644
> --- a/kernel/trace/trace.h
> +++ b/kernel/trace/trace.h
> @@ -210,6 +210,11 @@ struct trace_array {
> struct list_head events;
> cpumask_var_t tracing_cpumask; /* only trace on set CPUs */
> int ref;
> +#ifdef CONFIG_FUNCTION_TRACER
> + struct ftrace_ops *ops;
> + /* function tracing enabled */
> + int function_enabled;
> +#endif
> };
>
> enum {
> @@ -355,14 +360,16 @@ struct tracer {
> void (*print_header)(struct seq_file *m);
> enum print_line_t (*print_line)(struct trace_iterator *iter);
> /* If you handled the flag setting, return 0 */
> - int (*set_flag)(u32 old_flags, u32 bit, int set);
> + int (*set_flag)(struct trace_array *tr,
> + u32 old_flags, u32 bit, int set);
> /* Return 0 if OK with change, else return non-zero */
> - int (*flag_changed)(struct tracer *tracer,
> + int (*flag_changed)(struct trace_array *tr,
> u32 mask, int set);
> struct tracer *next;
> struct tracer_flags *flags;
> + int enabled;
> bool print_max;
> - bool enabled;
> + bool allow_instances;
> #ifdef CONFIG_TRACER_MAX_TRACE
> bool use_max_tr;
> #endif
> @@ -812,13 +819,36 @@ static inline int ftrace_trace_task(struct task_struct *task)
> return test_tsk_trace_trace(task);
> }
> extern int ftrace_is_dead(void);
> +int ftrace_create_function_files(struct trace_array *tr,
> + struct dentry *parent);
> +void ftrace_destroy_function_files(struct trace_array *tr);
> #else
> static inline int ftrace_trace_task(struct task_struct *task)
> {
> return 1;
> }
> static inline int ftrace_is_dead(void) { return 0; }
> -#endif
> +static inline int
> +ftrace_create_function_files(struct trace_array *tr,
> + struct dentry *parent)
> +{
> + return 0;
> +}
> +static inline void ftrace_destroy_function_files(struct trace_array *tr) { }
> +#endif /* CONFIG_FUNCTION_TRACER */
> +
> +#if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE)
> +void ftrace_create_filter_files(struct ftrace_ops *ops,
> + struct dentry *parent);
> +void ftrace_destroy_filter_files(struct ftrace_ops *ops);
> +#else
> +/*
> + * The ops parameter passed in is usually undefined.
> + * This must be a macro.
> + */
> +#define ftrace_create_filter_files(ops, parent) do { } while (0)
> +#define ftrace_destroy_filter_files(ops) do { } while (0)
> +#endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */
>
> int ftrace_event_is_function(struct ftrace_event_call *call);
>
> diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
> index e71ffd4..2f7b8e3 100644
> --- a/kernel/trace/trace_events.c
> +++ b/kernel/trace/trace_events.c
> @@ -194,6 +194,36 @@ int trace_event_raw_init(struct ftrace_event_call *call)
> }
> EXPORT_SYMBOL_GPL(trace_event_raw_init);
>
> +void *ftrace_event_buffer_reserve(struct ftrace_event_buffer *fbuffer,
> + struct ftrace_event_file *ftrace_file,
> + unsigned long len)
> +{
> + struct ftrace_event_call *event_call = ftrace_file->event_call;
> +
> + local_save_flags(fbuffer->flags);
> + fbuffer->pc = preempt_count();
> + fbuffer->ftrace_file = ftrace_file;
> +
> + fbuffer->event =
> + trace_event_buffer_lock_reserve(&fbuffer->buffer, ftrace_file,
> + event_call->event.type, len,
> + fbuffer->flags, fbuffer->pc);
> + if (!fbuffer->event)
> + return NULL;
> +
> + fbuffer->entry = ring_buffer_event_data(fbuffer->event);
> + return fbuffer->entry;
> +}
> +EXPORT_SYMBOL_GPL(ftrace_event_buffer_reserve);
> +
> +void ftrace_event_buffer_commit(struct ftrace_event_buffer *fbuffer)
> +{
> + event_trigger_unlock_commit(fbuffer->ftrace_file, fbuffer->buffer,
> + fbuffer->event, fbuffer->entry,
> + fbuffer->flags, fbuffer->pc);
> +}
> +EXPORT_SYMBOL_GPL(ftrace_event_buffer_commit);
> +
> int ftrace_event_reg(struct ftrace_event_call *call,
> enum trace_reg type, void *data)
> {
> diff --git a/kernel/trace/trace_functions.c b/kernel/trace/trace_functions.c
> index 38fe148..5b781d2 100644
> --- a/kernel/trace/trace_functions.c
> +++ b/kernel/trace/trace_functions.c
> @@ -13,32 +13,106 @@
> #include <linux/debugfs.h>
> #include <linux/uaccess.h>
> #include <linux/ftrace.h>
> +#include <linux/slab.h>
> #include <linux/fs.h>
>
> #include "trace.h"
>
> -/* function tracing enabled */
> -static int ftrace_function_enabled;
> +static void tracing_start_function_trace(struct trace_array *tr);
> +static void tracing_stop_function_trace(struct trace_array *tr);
> +static void
> +function_trace_call(unsigned long ip, unsigned long parent_ip,
> + struct ftrace_ops *op, struct pt_regs *pt_regs);
> +static void
> +function_stack_trace_call(unsigned long ip, unsigned long parent_ip,
> + struct ftrace_ops *op, struct pt_regs *pt_regs);
> +static struct ftrace_ops trace_ops;
> +static struct ftrace_ops trace_stack_ops;
> +static struct tracer_flags func_flags;
> +
> +/* Our option */
> +enum {
> + TRACE_FUNC_OPT_STACK = 0x1,
> +};
> +
> +static int allocate_ftrace_ops(struct trace_array *tr)
> +{
> + struct ftrace_ops *ops;
> +
> + ops = kzalloc(sizeof(*ops), GFP_KERNEL);
> + if (!ops)
> + return -ENOMEM;
>
> -static struct trace_array *func_trace;
> + /* Currently only the non stack verision is supported */
> + ops->func = function_trace_call;
> + ops->flags = FTRACE_OPS_FL_RECURSION_SAFE;
> +
> + tr->ops = ops;
> + ops->private = tr;
> + return 0;
> +}
> +
> +
> +int ftrace_create_function_files(struct trace_array *tr,
> + struct dentry *parent)
> +{
> + int ret;
> +
> + /* The top level array uses the "global_ops". */
> + if (!(tr->flags & TRACE_ARRAY_FL_GLOBAL)) {
> + ret = allocate_ftrace_ops(tr);
> + if (ret)
> + return ret;
> + }
> +
> + ftrace_create_filter_files(tr->ops, parent);
> +
> + return 0;
> +}
>
> -static void tracing_start_function_trace(void);
> -static void tracing_stop_function_trace(void);
> +void ftrace_destroy_function_files(struct trace_array *tr)
> +{
> + ftrace_destroy_filter_files(tr->ops);
> + kfree(tr->ops);
> + tr->ops = NULL;
> +}
>
> static int function_trace_init(struct trace_array *tr)
> {
> - func_trace = tr;
> + struct ftrace_ops *ops;
> +
> + if (tr->flags & TRACE_ARRAY_FL_GLOBAL) {
> + /* There's only one global tr */
> + if (!trace_ops.private) {
> + trace_ops.private = tr;
> + trace_stack_ops.private = tr;
> + }
> +
> + if (func_flags.val & TRACE_FUNC_OPT_STACK)
> + ops = &trace_stack_ops;
> + else
> + ops = &trace_ops;
> + tr->ops = ops;
> + } else if (!tr->ops) {
> + /*
> + * Instance trace_arrays get their ops allocated
> + * at instance creation. Unless it failed
> + * the allocation.
> + */
> + return -ENOMEM;
> + }
> +
> tr->trace_buffer.cpu = get_cpu();
> put_cpu();
>
> tracing_start_cmdline_record();
> - tracing_start_function_trace();
> + tracing_start_function_trace(tr);
> return 0;
> }
>
> static void function_trace_reset(struct trace_array *tr)
> {
> - tracing_stop_function_trace();
> + tracing_stop_function_trace(tr);
> tracing_stop_cmdline_record();
> }
>
> @@ -47,25 +121,18 @@ static void function_trace_start(struct trace_array *tr)
> tracing_reset_online_cpus(&tr->trace_buffer);
> }
>
> -/* Our option */
> -enum {
> - TRACE_FUNC_OPT_STACK = 0x1,
> -};
> -
> -static struct tracer_flags func_flags;
> -
> static void
> function_trace_call(unsigned long ip, unsigned long parent_ip,
> struct ftrace_ops *op, struct pt_regs *pt_regs)
> {
> - struct trace_array *tr = func_trace;
> + struct trace_array *tr = op->private;
> struct trace_array_cpu *data;
> unsigned long flags;
> int bit;
> int cpu;
> int pc;
>
> - if (unlikely(!ftrace_function_enabled))
> + if (unlikely(!tr->function_enabled))
> return;
>
> pc = preempt_count();
> @@ -91,14 +158,14 @@ static void
> function_stack_trace_call(unsigned long ip, unsigned long parent_ip,
> struct ftrace_ops *op, struct pt_regs *pt_regs)
> {
> - struct trace_array *tr = func_trace;
> + struct trace_array *tr = op->private;
> struct trace_array_cpu *data;
> unsigned long flags;
> long disabled;
> int cpu;
> int pc;
>
> - if (unlikely(!ftrace_function_enabled))
> + if (unlikely(!tr->function_enabled))
> return;
>
> /*
> @@ -128,7 +195,6 @@ function_stack_trace_call(unsigned long ip, unsigned long parent_ip,
> local_irq_restore(flags);
> }
>
> -
> static struct ftrace_ops trace_ops __read_mostly =
> {
> .func = function_trace_call,
> @@ -153,29 +219,21 @@ static struct tracer_flags func_flags = {
> .opts = func_opts
> };
>
> -static void tracing_start_function_trace(void)
> +static void tracing_start_function_trace(struct trace_array *tr)
> {
> - ftrace_function_enabled = 0;
> -
> - if (func_flags.val & TRACE_FUNC_OPT_STACK)
> - register_ftrace_function(&trace_stack_ops);
> - else
> - register_ftrace_function(&trace_ops);
> -
> - ftrace_function_enabled = 1;
> + tr->function_enabled = 0;
> + register_ftrace_function(tr->ops);
> + tr->function_enabled = 1;
> }
>
> -static void tracing_stop_function_trace(void)
> +static void tracing_stop_function_trace(struct trace_array *tr)
> {
> - ftrace_function_enabled = 0;
> -
> - if (func_flags.val & TRACE_FUNC_OPT_STACK)
> - unregister_ftrace_function(&trace_stack_ops);
> - else
> - unregister_ftrace_function(&trace_ops);
> + tr->function_enabled = 0;
> + unregister_ftrace_function(tr->ops);
> }
>
> -static int func_set_flag(u32 old_flags, u32 bit, int set)
> +static int
> +func_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set)
> {
> switch (bit) {
> case TRACE_FUNC_OPT_STACK:
> @@ -183,12 +241,14 @@ static int func_set_flag(u32 old_flags, u32 bit, int set)
> if (!!set == !!(func_flags.val & TRACE_FUNC_OPT_STACK))
> break;
>
> + unregister_ftrace_function(tr->ops);
> +
> if (set) {
> - unregister_ftrace_function(&trace_ops);
> - register_ftrace_function(&trace_stack_ops);
> + tr->ops = &trace_stack_ops;
> + register_ftrace_function(tr->ops);
> } else {
> - unregister_ftrace_function(&trace_stack_ops);
> - register_ftrace_function(&trace_ops);
> + tr->ops = &trace_ops;
> + register_ftrace_function(tr->ops);
> }
>
> break;
> @@ -208,6 +268,7 @@ static struct tracer function_trace __tracer_data =
> .wait_pipe = poll_wait_pipe,
> .flags = &func_flags,
> .set_flag = func_set_flag,
> + .allow_instances = true,
> #ifdef CONFIG_FTRACE_SELFTEST
> .selftest = trace_selftest_startup_function,
> #endif
> diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
> index 0b99120..deff112 100644
> --- a/kernel/trace/trace_functions_graph.c
> +++ b/kernel/trace/trace_functions_graph.c
> @@ -1476,7 +1476,8 @@ void graph_trace_close(struct trace_iterator *iter)
> }
> }
>
> -static int func_graph_set_flag(u32 old_flags, u32 bit, int set)
> +static int
> +func_graph_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set)
> {
> if (bit == TRACE_GRAPH_PRINT_IRQS)
> ftrace_graph_skip_irqs = !set;
> diff --git a/kernel/trace/trace_irqsoff.c b/kernel/trace/trace_irqsoff.c
> index 2aefbee..4bf812f 100644
> --- a/kernel/trace/trace_irqsoff.c
> +++ b/kernel/trace/trace_irqsoff.c
> @@ -160,7 +160,8 @@ static struct ftrace_ops trace_ops __read_mostly =
> #endif /* CONFIG_FUNCTION_TRACER */
>
> #ifdef CONFIG_FUNCTION_GRAPH_TRACER
> -static int irqsoff_set_flag(u32 old_flags, u32 bit, int set)
> +static int
> +irqsoff_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set)
> {
> int cpu;
>
> @@ -266,7 +267,8 @@ __trace_function(struct trace_array *tr,
> #else
> #define __trace_function trace_function
>
> -static int irqsoff_set_flag(u32 old_flags, u32 bit, int set)
> +static int
> +irqsoff_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set)
> {
> return -EINVAL;
> }
> @@ -570,8 +572,10 @@ static void irqsoff_function_set(int set)
> unregister_irqsoff_function(is_graph());
> }
>
> -static int irqsoff_flag_changed(struct tracer *tracer, u32 mask, int set)
> +static int irqsoff_flag_changed(struct trace_array *tr, u32 mask, int set)
> {
> + struct tracer *tracer = tr->current_trace;
> +
> if (mask & TRACE_ITER_FUNCTION)
> irqsoff_function_set(set);
>
> diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
> index bdbae45..d021d21 100644
> --- a/kernel/trace/trace_kprobe.c
> +++ b/kernel/trace/trace_kprobe.c
> @@ -35,11 +35,6 @@ struct trace_kprobe {
> struct trace_probe tp;
> };
>
> -struct event_file_link {
> - struct ftrace_event_file *file;
> - struct list_head list;
> -};
> -
> #define SIZEOF_TRACE_KPROBE(n) \
> (offsetof(struct trace_kprobe, tp.args) + \
> (sizeof(struct probe_arg) * (n)))
> @@ -387,18 +382,6 @@ enable_trace_kprobe(struct trace_kprobe *tk, struct ftrace_event_file *file)
> return ret;
> }
>
> -static struct event_file_link *
> -find_event_file_link(struct trace_probe *tp, struct ftrace_event_file *file)
> -{
> - struct event_file_link *link;
> -
> - list_for_each_entry(link, &tp->files, list)
> - if (link->file == file)
> - return link;
> -
> - return NULL;
> -}
> -
> /*
> * Disable trace_probe
> * if the file is NULL, disable "perf" handler, or disable "trace" handler.
> diff --git a/kernel/trace/trace_nop.c b/kernel/trace/trace_nop.c
> index 394f944..69a5cc9 100644
> --- a/kernel/trace/trace_nop.c
> +++ b/kernel/trace/trace_nop.c
> @@ -62,7 +62,7 @@ static void nop_trace_reset(struct trace_array *tr)
> * If you don't implement it, then the flag setting will be
> * automatically accepted.
> */
> -static int nop_set_flag(u32 old_flags, u32 bit, int set)
> +static int nop_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set)
> {
> /*
> * Note that you don't need to update nop_flags.val yourself.
> @@ -96,6 +96,7 @@ struct tracer nop_trace __read_mostly =
> .selftest = trace_selftest_startup_nop,
> #endif
> .flags = &nop_flags,
> - .set_flag = nop_set_flag
> + .set_flag = nop_set_flag,
> + .allow_instances = true,
> };
>
> diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
> index ed32284..ca0e79e2 100644
> --- a/kernel/trace/trace_output.c
> +++ b/kernel/trace/trace_output.c
> @@ -439,6 +439,37 @@ int ftrace_raw_output_prep(struct trace_iterator *iter,
> }
> EXPORT_SYMBOL(ftrace_raw_output_prep);
>
> +static int ftrace_output_raw(struct trace_iterator *iter, char *name,
> + char *fmt, va_list ap)
> +{
> + struct trace_seq *s = &iter->seq;
> + int ret;
> +
> + ret = trace_seq_printf(s, "%s: ", name);
> + if (!ret)
> + return TRACE_TYPE_PARTIAL_LINE;
> +
> + ret = trace_seq_vprintf(s, fmt, ap);
> +
> + if (!ret)
> + return TRACE_TYPE_PARTIAL_LINE;
> +
> + return TRACE_TYPE_HANDLED;
> +}
> +
> +int ftrace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...)
> +{
> + va_list ap;
> + int ret;
> +
> + va_start(ap, fmt);
> + ret = ftrace_output_raw(iter, name, fmt, ap);
> + va_end(ap);
> +
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(ftrace_output_call);
> +
> #ifdef CONFIG_KRETPROBES
> static inline const char *kretprobed(const char *name)
> {
> diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h
> index b73574a..fb1ab5d 100644
> --- a/kernel/trace/trace_probe.h
> +++ b/kernel/trace/trace_probe.h
> @@ -288,6 +288,11 @@ struct trace_probe {
> struct probe_arg args[];
> };
>
> +struct event_file_link {
> + struct ftrace_event_file *file;
> + struct list_head list;
> +};
> +
> static inline bool trace_probe_is_enabled(struct trace_probe *tp)
> {
> return !!(tp->flags & (TP_FLAG_TRACE | TP_FLAG_PROFILE));
> @@ -316,6 +321,18 @@ static inline int is_good_name(const char *name)
> return 1;
> }
>
> +static inline struct event_file_link *
> +find_event_file_link(struct trace_probe *tp, struct ftrace_event_file *file)
> +{
> + struct event_file_link *link;
> +
> + list_for_each_entry(link, &tp->files, list)
> + if (link->file == file)
> + return link;
> +
> + return NULL;
> +}
> +
> extern int traceprobe_parse_probe_arg(char *arg, ssize_t *size,
> struct probe_arg *parg, bool is_return, bool is_kprobe);
>
> diff --git a/kernel/trace/trace_sched_wakeup.c b/kernel/trace/trace_sched_wakeup.c
> index 6e32635..e14da5e 100644
> --- a/kernel/trace/trace_sched_wakeup.c
> +++ b/kernel/trace/trace_sched_wakeup.c
> @@ -179,8 +179,10 @@ static void wakeup_function_set(int set)
> unregister_wakeup_function(is_graph());
> }
>
> -static int wakeup_flag_changed(struct tracer *tracer, u32 mask, int set)
> +static int wakeup_flag_changed(struct trace_array *tr, u32 mask, int set)
> {
> + struct tracer *tracer = tr->current_trace;
> +
> if (mask & TRACE_ITER_FUNCTION)
> wakeup_function_set(set);
>
> @@ -209,7 +211,8 @@ static void stop_func_tracer(int graph)
> }
>
> #ifdef CONFIG_FUNCTION_GRAPH_TRACER
> -static int wakeup_set_flag(u32 old_flags, u32 bit, int set)
> +static int
> +wakeup_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set)
> {
>
> if (!(bit & TRACE_DISPLAY_GRAPH))
> @@ -311,7 +314,8 @@ __trace_function(struct trace_array *tr,
> #else
> #define __trace_function trace_function
>
> -static int wakeup_set_flag(u32 old_flags, u32 bit, int set)
> +static int
> +wakeup_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set)
> {
> return -EINVAL;
> }
> diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c
> index e6be585..21b320e 100644
> --- a/kernel/trace/trace_stack.c
> +++ b/kernel/trace/trace_stack.c
> @@ -13,6 +13,7 @@
> #include <linux/sysctl.h>
> #include <linux/init.h>
> #include <linux/fs.h>
> +#include <linux/magic.h>
>
> #include <asm/setup.h>
>
> @@ -144,6 +145,8 @@ check_stack(unsigned long ip, unsigned long *stack)
> i++;
> }
>
> + BUG_ON(current != &init_task &&
> + *(end_of_stack(current)) != STACK_END_MAGIC);
> out:
> arch_spin_unlock(&max_stack_lock);
> local_irq_restore(flags);
> diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
> index 79e52d9..e447336 100644
> --- a/kernel/trace/trace_uprobe.c
> +++ b/kernel/trace/trace_uprobe.c
> @@ -260,6 +260,7 @@ alloc_trace_uprobe(const char *group, const char *event, int nargs, bool is_ret)
> goto error;
>
> INIT_LIST_HEAD(&tu->list);
> + INIT_LIST_HEAD(&tu->tp.files);
> tu->consumer.handler = uprobe_dispatcher;
> if (is_ret)
> tu->consumer.ret_handler = uretprobe_dispatcher;
> @@ -758,31 +759,32 @@ static void uprobe_buffer_put(struct uprobe_cpu_buffer *ucb)
> mutex_unlock(&ucb->mutex);
> }
>
> -static void uprobe_trace_print(struct trace_uprobe *tu,
> - unsigned long func, struct pt_regs *regs)
> +static void __uprobe_trace_func(struct trace_uprobe *tu,
> + unsigned long func, struct pt_regs *regs,
> + struct uprobe_cpu_buffer *ucb, int dsize,
> + struct ftrace_event_file *ftrace_file)
> {
> struct uprobe_trace_entry_head *entry;
> struct ring_buffer_event *event;
> struct ring_buffer *buffer;
> - struct uprobe_cpu_buffer *ucb;
> void *data;
> - int size, dsize, esize;
> + int size, esize;
> struct ftrace_event_call *call = &tu->tp.call;
>
> - dsize = __get_data_size(&tu->tp, regs);
> - esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
> + WARN_ON(call != ftrace_file->event_call);
>
> - if (WARN_ON_ONCE(!uprobe_cpu_buffer || tu->tp.size + dsize > PAGE_SIZE))
> + if (WARN_ON_ONCE(tu->tp.size + dsize > PAGE_SIZE))
> return;
>
> - ucb = uprobe_buffer_get();
> - store_trace_args(esize, &tu->tp, regs, ucb->buf, dsize);
> + if (ftrace_trigger_soft_disabled(ftrace_file))
> + return;
>
> + esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
> size = esize + tu->tp.size + dsize;
> - event = trace_current_buffer_lock_reserve(&buffer, call->event.type,
> - size, 0, 0);
> + event = trace_event_buffer_lock_reserve(&buffer, ftrace_file,
> + call->event.type, size, 0, 0);
> if (!event)
> - goto out;
> + return;
>
> entry = ring_buffer_event_data(event);
> if (is_ret_probe(tu)) {
> @@ -796,25 +798,36 @@ static void uprobe_trace_print(struct trace_uprobe *tu,
>
> memcpy(data, ucb->buf, tu->tp.size + dsize);
>
> - if (!call_filter_check_discard(call, entry, buffer, event))
> - trace_buffer_unlock_commit(buffer, event, 0, 0);
> -
> -out:
> - uprobe_buffer_put(ucb);
> + event_trigger_unlock_commit(ftrace_file, buffer, event, entry, 0, 0);
> }
>
> /* uprobe handler */
> -static int uprobe_trace_func(struct trace_uprobe *tu, struct pt_regs *regs)
> +static int uprobe_trace_func(struct trace_uprobe *tu, struct pt_regs *regs,
> + struct uprobe_cpu_buffer *ucb, int dsize)
> {
> - if (!is_ret_probe(tu))
> - uprobe_trace_print(tu, 0, regs);
> + struct event_file_link *link;
> +
> + if (is_ret_probe(tu))
> + return 0;
> +
> + rcu_read_lock();
> + list_for_each_entry_rcu(link, &tu->tp.files, list)
> + __uprobe_trace_func(tu, 0, regs, ucb, dsize, link->file);
> + rcu_read_unlock();
> +
> return 0;
> }
>
> static void uretprobe_trace_func(struct trace_uprobe *tu, unsigned long func,
> - struct pt_regs *regs)
> + struct pt_regs *regs,
> + struct uprobe_cpu_buffer *ucb, int dsize)
> {
> - uprobe_trace_print(tu, func, regs);
> + struct event_file_link *link;
> +
> + rcu_read_lock();
> + list_for_each_entry_rcu(link, &tu->tp.files, list)
> + __uprobe_trace_func(tu, func, regs, ucb, dsize, link->file);
> + rcu_read_unlock();
> }
>
> /* Event entry printers */
> @@ -861,12 +874,24 @@ typedef bool (*filter_func_t)(struct uprobe_consumer *self,
> struct mm_struct *mm);
>
> static int
> -probe_event_enable(struct trace_uprobe *tu, int flag, filter_func_t filter)
> +probe_event_enable(struct trace_uprobe *tu, struct ftrace_event_file *file,
> + filter_func_t filter)
> {
> - int ret = 0;
> + bool enabled = trace_probe_is_enabled(&tu->tp);
> + struct event_file_link *link = NULL;
> + int ret;
> +
> + if (file) {
> + link = kmalloc(sizeof(*link), GFP_KERNEL);
> + if (!link)
> + return -ENOMEM;
>
> - if (trace_probe_is_enabled(&tu->tp))
> - return -EINTR;
> + link->file = file;
> + list_add_tail_rcu(&link->list, &tu->tp.files);
> +
> + tu->tp.flags |= TP_FLAG_TRACE;
> + } else
> + tu->tp.flags |= TP_FLAG_PROFILE;
>
> ret = uprobe_buffer_enable();
> if (ret < 0)
> @@ -874,24 +899,49 @@ probe_event_enable(struct trace_uprobe *tu, int flag, filter_func_t filter)
>
> WARN_ON(!uprobe_filter_is_empty(&tu->filter));
>
> - tu->tp.flags |= flag;
> + if (enabled)
> + return 0;
> +
> tu->consumer.filter = filter;
> ret = uprobe_register(tu->inode, tu->offset, &tu->consumer);
> - if (ret)
> - tu->tp.flags &= ~flag;
> + if (ret) {
> + if (file) {
> + list_del(&link->list);
> + kfree(link);
> + tu->tp.flags &= ~TP_FLAG_TRACE;
> + } else
> + tu->tp.flags &= ~TP_FLAG_PROFILE;
> + }
>
> return ret;
> }
>
> -static void probe_event_disable(struct trace_uprobe *tu, int flag)
> +static void
> +probe_event_disable(struct trace_uprobe *tu, struct ftrace_event_file *file)
> {
> if (!trace_probe_is_enabled(&tu->tp))
> return;
>
> + if (file) {
> + struct event_file_link *link;
> +
> + link = find_event_file_link(&tu->tp, file);
> + if (!link)
> + return;
> +
> + list_del_rcu(&link->list);
> + /* synchronize with u{,ret}probe_trace_func */
> + synchronize_sched();
> + kfree(link);
> +
> + if (!list_empty(&tu->tp.files))
> + return;
> + }
> +
> WARN_ON(!uprobe_filter_is_empty(&tu->filter));
>
> uprobe_unregister(tu->inode, tu->offset, &tu->consumer);
> - tu->tp.flags &= ~flag;
> + tu->tp.flags &= file ? ~TP_FLAG_TRACE : ~TP_FLAG_PROFILE;
>
> uprobe_buffer_disable();
> }
> @@ -1014,31 +1064,24 @@ static bool uprobe_perf_filter(struct uprobe_consumer *uc,
> return ret;
> }
>
> -static void uprobe_perf_print(struct trace_uprobe *tu,
> - unsigned long func, struct pt_regs *regs)
> +static void __uprobe_perf_func(struct trace_uprobe *tu,
> + unsigned long func, struct pt_regs *regs,
> + struct uprobe_cpu_buffer *ucb, int dsize)
> {
> struct ftrace_event_call *call = &tu->tp.call;
> struct uprobe_trace_entry_head *entry;
> struct hlist_head *head;
> - struct uprobe_cpu_buffer *ucb;
> void *data;
> - int size, dsize, esize;
> + int size, esize;
> int rctx;
>
> - dsize = __get_data_size(&tu->tp, regs);
> esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
>
> - if (WARN_ON_ONCE(!uprobe_cpu_buffer))
> - return;
> -
> size = esize + tu->tp.size + dsize;
> size = ALIGN(size + sizeof(u32), sizeof(u64)) - sizeof(u32);
> if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE, "profile buffer not large enough"))
> return;
>
> - ucb = uprobe_buffer_get();
> - store_trace_args(esize, &tu->tp, regs, ucb->buf, dsize);
> -
> preempt_disable();
> head = this_cpu_ptr(call->perf_events);
> if (hlist_empty(head))
> @@ -1068,46 +1111,49 @@ static void uprobe_perf_print(struct trace_uprobe *tu,
> perf_trace_buf_submit(entry, size, rctx, 0, 1, regs, head, NULL);
> out:
> preempt_enable();
> - uprobe_buffer_put(ucb);
> }
>
> /* uprobe profile handler */
> -static int uprobe_perf_func(struct trace_uprobe *tu, struct pt_regs *regs)
> +static int uprobe_perf_func(struct trace_uprobe *tu, struct pt_regs *regs,
> + struct uprobe_cpu_buffer *ucb, int dsize)
> {
> if (!uprobe_perf_filter(&tu->consumer, 0, current->mm))
> return UPROBE_HANDLER_REMOVE;
>
> if (!is_ret_probe(tu))
> - uprobe_perf_print(tu, 0, regs);
> + __uprobe_perf_func(tu, 0, regs, ucb, dsize);
> return 0;
> }
>
> static void uretprobe_perf_func(struct trace_uprobe *tu, unsigned long func,
> - struct pt_regs *regs)
> + struct pt_regs *regs,
> + struct uprobe_cpu_buffer *ucb, int dsize)
> {
> - uprobe_perf_print(tu, func, regs);
> + __uprobe_perf_func(tu, func, regs, ucb, dsize);
> }
> #endif /* CONFIG_PERF_EVENTS */
>
> -static
> -int trace_uprobe_register(struct ftrace_event_call *event, enum trace_reg type, void *data)
> +static int
> +trace_uprobe_register(struct ftrace_event_call *event, enum trace_reg type,
> + void *data)
> {
> struct trace_uprobe *tu = event->data;
> + struct ftrace_event_file *file = data;
>
> switch (type) {
> case TRACE_REG_REGISTER:
> - return probe_event_enable(tu, TP_FLAG_TRACE, NULL);
> + return probe_event_enable(tu, file, NULL);
>
> case TRACE_REG_UNREGISTER:
> - probe_event_disable(tu, TP_FLAG_TRACE);
> + probe_event_disable(tu, file);
> return 0;
>
> #ifdef CONFIG_PERF_EVENTS
> case TRACE_REG_PERF_REGISTER:
> - return probe_event_enable(tu, TP_FLAG_PROFILE, uprobe_perf_filter);
> + return probe_event_enable(tu, NULL, uprobe_perf_filter);
>
> case TRACE_REG_PERF_UNREGISTER:
> - probe_event_disable(tu, TP_FLAG_PROFILE);
> + probe_event_disable(tu, NULL);
> return 0;
>
> case TRACE_REG_PERF_OPEN:
> @@ -1127,8 +1173,11 @@ static int uprobe_dispatcher(struct uprobe_consumer *con, struct pt_regs *regs)
> {
> struct trace_uprobe *tu;
> struct uprobe_dispatch_data udd;
> + struct uprobe_cpu_buffer *ucb;
> + int dsize, esize;
> int ret = 0;
>
> +
> tu = container_of(con, struct trace_uprobe, consumer);
> tu->nhit++;
>
> @@ -1137,13 +1186,29 @@ static int uprobe_dispatcher(struct uprobe_consumer *con, struct pt_regs *regs)
>
> current->utask->vaddr = (unsigned long) &udd;
>
> +#ifdef CONFIG_PERF_EVENTS
> + if ((tu->tp.flags & TP_FLAG_TRACE) == 0 &&
> + !uprobe_perf_filter(&tu->consumer, 0, current->mm))
> + return UPROBE_HANDLER_REMOVE;
> +#endif
> +
> + if (WARN_ON_ONCE(!uprobe_cpu_buffer))
> + return 0;
> +
> + dsize = __get_data_size(&tu->tp, regs);
> + esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
> +
> + ucb = uprobe_buffer_get();
> + store_trace_args(esize, &tu->tp, regs, ucb->buf, dsize);
> +
> if (tu->tp.flags & TP_FLAG_TRACE)
> - ret |= uprobe_trace_func(tu, regs);
> + ret |= uprobe_trace_func(tu, regs, ucb, dsize);
>
> #ifdef CONFIG_PERF_EVENTS
> if (tu->tp.flags & TP_FLAG_PROFILE)
> - ret |= uprobe_perf_func(tu, regs);
> + ret |= uprobe_perf_func(tu, regs, ucb, dsize);
> #endif
> + uprobe_buffer_put(ucb);
> return ret;
> }
>
> @@ -1152,6 +1217,8 @@ static int uretprobe_dispatcher(struct uprobe_consumer *con,
> {
> struct trace_uprobe *tu;
> struct uprobe_dispatch_data udd;
> + struct uprobe_cpu_buffer *ucb;
> + int dsize, esize;
>
> tu = container_of(con, struct trace_uprobe, consumer);
>
> @@ -1160,13 +1227,23 @@ static int uretprobe_dispatcher(struct uprobe_consumer *con,
>
> current->utask->vaddr = (unsigned long) &udd;
>
> + if (WARN_ON_ONCE(!uprobe_cpu_buffer))
> + return 0;
> +
> + dsize = __get_data_size(&tu->tp, regs);
> + esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
> +
> + ucb = uprobe_buffer_get();
> + store_trace_args(esize, &tu->tp, regs, ucb->buf, dsize);
> +
> if (tu->tp.flags & TP_FLAG_TRACE)
> - uretprobe_trace_func(tu, func, regs);
> + uretprobe_trace_func(tu, func, regs, ucb, dsize);
>
> #ifdef CONFIG_PERF_EVENTS
> if (tu->tp.flags & TP_FLAG_PROFILE)
> - uretprobe_perf_func(tu, func, regs);
> + uretprobe_perf_func(tu, func, regs, ucb, dsize);
> #endif
> + uprobe_buffer_put(ucb);
> return 0;
> }
>
> diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c
> index 29f2654..65d9f94 100644
> --- a/kernel/tracepoint.c
> +++ b/kernel/tracepoint.c
> @@ -62,14 +62,12 @@ struct tracepoint_entry {
> struct hlist_node hlist;
> struct tracepoint_func *funcs;
> int refcount; /* Number of times armed. 0 if disarmed. */
> + int enabled; /* Tracepoint enabled */
> char name[0];
> };
>
> struct tp_probes {
> - union {
> - struct rcu_head rcu;
> - struct list_head list;
> - } u;
> + struct rcu_head rcu;
> struct tracepoint_func probes[0];
> };
>
> @@ -82,7 +80,7 @@ static inline void *allocate_probes(int count)
>
> static void rcu_free_old_probes(struct rcu_head *head)
> {
> - kfree(container_of(head, struct tp_probes, u.rcu));
> + kfree(container_of(head, struct tp_probes, rcu));
> }
>
> static inline void release_probes(struct tracepoint_func *old)
> @@ -90,7 +88,7 @@ static inline void release_probes(struct tracepoint_func *old)
> if (old) {
> struct tp_probes *tp_probes = container_of(old,
> struct tp_probes, probes[0]);
> - call_rcu_sched(&tp_probes->u.rcu, rcu_free_old_probes);
> + call_rcu_sched(&tp_probes->rcu, rcu_free_old_probes);
> }
> }
>
> @@ -237,6 +235,7 @@ static struct tracepoint_entry *add_tracepoint(const char *name)
> memcpy(&e->name[0], name, name_len);
> e->funcs = NULL;
> e->refcount = 0;
> + e->enabled = 0;
> hlist_add_head(&e->hlist, head);
> return e;
> }
> @@ -316,6 +315,7 @@ static void tracepoint_update_probe_range(struct tracepoint * const *begin,
> if (mark_entry) {
> set_tracepoint(&mark_entry, *iter,
> !!mark_entry->refcount);
> + mark_entry->enabled = !!mark_entry->refcount;
> } else {
> disable_tracepoint(*iter);
> }
> @@ -373,13 +373,26 @@ tracepoint_add_probe(const char *name, void *probe, void *data)
> * tracepoint_probe_register - Connect a probe to a tracepoint
> * @name: tracepoint name
> * @probe: probe handler
> + * @data: probe private data
> + *
> + * Returns:
> + * - 0 if the probe was successfully registered, and tracepoint
> + * callsites are currently loaded for that probe,
> + * - -ENODEV if the probe was successfully registered, but no tracepoint
> + * callsite is currently loaded for that probe,
> + * - other negative error value on error.
> + *
> + * When tracepoint_probe_register() returns either 0 or -ENODEV,
> + * parameters @name, @probe, and @data may be used by the tracepoint
> + * infrastructure until the probe is unregistered.
> *
> - * Returns 0 if ok, error value on error.
> * The probe address must at least be aligned on the architecture pointer size.
> */
> int tracepoint_probe_register(const char *name, void *probe, void *data)
> {
> struct tracepoint_func *old;
> + struct tracepoint_entry *entry;
> + int ret = 0;
>
> mutex_lock(&tracepoints_mutex);
> old = tracepoint_add_probe(name, probe, data);
> @@ -388,9 +401,13 @@ int tracepoint_probe_register(const char *name, void *probe, void *data)
> return PTR_ERR(old);
> }
> tracepoint_update_probes(); /* may update entry */
> + entry = get_tracepoint(name);
> + /* Make sure the entry was enabled */
> + if (!entry || !entry->enabled)
> + ret = -ENODEV;
> mutex_unlock(&tracepoints_mutex);
> release_probes(old);
> - return 0;
> + return ret;
> }
> EXPORT_SYMBOL_GPL(tracepoint_probe_register);
>
> @@ -415,6 +432,7 @@ tracepoint_remove_probe(const char *name, void *probe, void *data)
> * tracepoint_probe_unregister - Disconnect a probe from a tracepoint
> * @name: tracepoint name
> * @probe: probe function pointer
> + * @data: probe private data
> *
> * We do not need to call a synchronize_sched to make sure the probes have
> * finished running before doing a module unload, because the module unload
> @@ -438,204 +456,16 @@ int tracepoint_probe_unregister(const char *name, void *probe, void *data)
> }
> EXPORT_SYMBOL_GPL(tracepoint_probe_unregister);
>
> -static LIST_HEAD(old_probes);
> -static int need_update;
> -
> -static void tracepoint_add_old_probes(void *old)
> -{
> - need_update = 1;
> - if (old) {
> - struct tp_probes *tp_probes = container_of(old,
> - struct tp_probes, probes[0]);
> - list_add(&tp_probes->u.list, &old_probes);
> - }
> -}
> -
> -/**
> - * tracepoint_probe_register_noupdate - register a probe but not connect
> - * @name: tracepoint name
> - * @probe: probe handler
> - *
> - * caller must call tracepoint_probe_update_all()
> - */
> -int tracepoint_probe_register_noupdate(const char *name, void *probe,
> - void *data)
> -{
> - struct tracepoint_func *old;
> -
> - mutex_lock(&tracepoints_mutex);
> - old = tracepoint_add_probe(name, probe, data);
> - if (IS_ERR(old)) {
> - mutex_unlock(&tracepoints_mutex);
> - return PTR_ERR(old);
> - }
> - tracepoint_add_old_probes(old);
> - mutex_unlock(&tracepoints_mutex);
> - return 0;
> -}
> -EXPORT_SYMBOL_GPL(tracepoint_probe_register_noupdate);
> -
> -/**
> - * tracepoint_probe_unregister_noupdate - remove a probe but not disconnect
> - * @name: tracepoint name
> - * @probe: probe function pointer
> - *
> - * caller must call tracepoint_probe_update_all()
> - */
> -int tracepoint_probe_unregister_noupdate(const char *name, void *probe,
> - void *data)
> -{
> - struct tracepoint_func *old;
> -
> - mutex_lock(&tracepoints_mutex);
> - old = tracepoint_remove_probe(name, probe, data);
> - if (IS_ERR(old)) {
> - mutex_unlock(&tracepoints_mutex);
> - return PTR_ERR(old);
> - }
> - tracepoint_add_old_probes(old);
> - mutex_unlock(&tracepoints_mutex);
> - return 0;
> -}
> -EXPORT_SYMBOL_GPL(tracepoint_probe_unregister_noupdate);
> -
> -/**
> - * tracepoint_probe_update_all - update tracepoints
> - */
> -void tracepoint_probe_update_all(void)
> -{
> - LIST_HEAD(release_probes);
> - struct tp_probes *pos, *next;
> -
> - mutex_lock(&tracepoints_mutex);
> - if (!need_update) {
> - mutex_unlock(&tracepoints_mutex);
> - return;
> - }
> - if (!list_empty(&old_probes))
> - list_replace_init(&old_probes, &release_probes);
> - need_update = 0;
> - tracepoint_update_probes();
> - mutex_unlock(&tracepoints_mutex);
> - list_for_each_entry_safe(pos, next, &release_probes, u.list) {
> - list_del(&pos->u.list);
> - call_rcu_sched(&pos->u.rcu, rcu_free_old_probes);
> - }
> -}
> -EXPORT_SYMBOL_GPL(tracepoint_probe_update_all);
> -
> -/**
> - * tracepoint_get_iter_range - Get a next tracepoint iterator given a range.
> - * @tracepoint: current tracepoints (in), next tracepoint (out)
> - * @begin: beginning of the range
> - * @end: end of the range
> - *
> - * Returns whether a next tracepoint has been found (1) or not (0).
> - * Will return the first tracepoint in the range if the input tracepoint is
> - * NULL.
> - */
> -static int tracepoint_get_iter_range(struct tracepoint * const **tracepoint,
> - struct tracepoint * const *begin, struct tracepoint * const *end)
> -{
> - if (!*tracepoint && begin != end) {
> - *tracepoint = begin;
> - return 1;
> - }
> - if (*tracepoint >= begin && *tracepoint < end)
> - return 1;
> - return 0;
> -}
> -
> -#ifdef CONFIG_MODULES
> -static void tracepoint_get_iter(struct tracepoint_iter *iter)
> -{
> - int found = 0;
> - struct tp_module *iter_mod;
> -
> - /* Core kernel tracepoints */
> - if (!iter->module) {
> - found = tracepoint_get_iter_range(&iter->tracepoint,
> - __start___tracepoints_ptrs,
> - __stop___tracepoints_ptrs);
> - if (found)
> - goto end;
> - }
> - /* Tracepoints in modules */
> - mutex_lock(&tracepoints_mutex);
> - list_for_each_entry(iter_mod, &tracepoint_module_list, list) {
> - /*
> - * Sorted module list
> - */
> - if (iter_mod < iter->module)
> - continue;
> - else if (iter_mod > iter->module)
> - iter->tracepoint = NULL;
> - found = tracepoint_get_iter_range(&iter->tracepoint,
> - iter_mod->tracepoints_ptrs,
> - iter_mod->tracepoints_ptrs
> - + iter_mod->num_tracepoints);
> - if (found) {
> - iter->module = iter_mod;
> - break;
> - }
> - }
> - mutex_unlock(&tracepoints_mutex);
> -end:
> - if (!found)
> - tracepoint_iter_reset(iter);
> -}
> -#else /* CONFIG_MODULES */
> -static void tracepoint_get_iter(struct tracepoint_iter *iter)
> -{
> - int found = 0;
> -
> - /* Core kernel tracepoints */
> - found = tracepoint_get_iter_range(&iter->tracepoint,
> - __start___tracepoints_ptrs,
> - __stop___tracepoints_ptrs);
> - if (!found)
> - tracepoint_iter_reset(iter);
> -}
> -#endif /* CONFIG_MODULES */
> -
> -void tracepoint_iter_start(struct tracepoint_iter *iter)
> -{
> - tracepoint_get_iter(iter);
> -}
> -EXPORT_SYMBOL_GPL(tracepoint_iter_start);
> -
> -void tracepoint_iter_next(struct tracepoint_iter *iter)
> -{
> - iter->tracepoint++;
> - /*
> - * iter->tracepoint may be invalid because we blindly incremented it.
> - * Make sure it is valid by marshalling on the tracepoints, getting the
> - * tracepoints from following modules if necessary.
> - */
> - tracepoint_get_iter(iter);
> -}
> -EXPORT_SYMBOL_GPL(tracepoint_iter_next);
> -
> -void tracepoint_iter_stop(struct tracepoint_iter *iter)
> -{
> -}
> -EXPORT_SYMBOL_GPL(tracepoint_iter_stop);
> -
> -void tracepoint_iter_reset(struct tracepoint_iter *iter)
> -{
> -#ifdef CONFIG_MODULES
> - iter->module = NULL;
> -#endif /* CONFIG_MODULES */
> - iter->tracepoint = NULL;
> -}
> -EXPORT_SYMBOL_GPL(tracepoint_iter_reset);
>
> #ifdef CONFIG_MODULES
> static int tracepoint_module_coming(struct module *mod)
> {
> - struct tp_module *tp_mod, *iter;
> + struct tp_module *tp_mod;
> int ret = 0;
>
> + if (!mod->num_tracepoints)
> + return 0;
> +
> /*
> * We skip modules that taint the kernel, especially those with different
> * module headers (for forced load), to make sure we don't cause a crash.
> @@ -651,23 +481,7 @@ static int tracepoint_module_coming(struct module *mod)
> }
> tp_mod->num_tracepoints = mod->num_tracepoints;
> tp_mod->tracepoints_ptrs = mod->tracepoints_ptrs;
> -
> - /*
> - * tracepoint_module_list is kept sorted by struct module pointer
> - * address for iteration on tracepoints from a seq_file that can release
> - * the mutex between calls.
> - */
> - list_for_each_entry_reverse(iter, &tracepoint_module_list, list) {
> - BUG_ON(iter == tp_mod); /* Should never be in the list twice */
> - if (iter < tp_mod) {
> - /* We belong to the location right after iter. */
> - list_add(&tp_mod->list, &iter->list);
> - goto module_added;
> - }
> - }
> - /* We belong to the beginning of the list */
> - list_add(&tp_mod->list, &tracepoint_module_list);
> -module_added:
> + list_add_tail(&tp_mod->list, &tracepoint_module_list);
> tracepoint_update_probe_range(mod->tracepoints_ptrs,
> mod->tracepoints_ptrs + mod->num_tracepoints);
> end:
> @@ -679,6 +493,9 @@ static int tracepoint_module_going(struct module *mod)
> {
> struct tp_module *pos;
>
> + if (!mod->num_tracepoints)
> + return 0;
> +
> mutex_lock(&tracepoints_mutex);
> tracepoint_update_probe_range(mod->tracepoints_ptrs,
> mod->tracepoints_ptrs + mod->num_tracepoints);
--
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